Monochrome Watches
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Just Because

Why Do Clocks and Watches Use the Roman Numeral IIII instead of IV?

The devil is in the details and this is a truly odd detail...

| By Brice Goulard | 9 min read |

Roman numerals are one of the most classic designs found on clocks and watches. As far as we can go back in history, there have always been clocks, pocket watches and wristwatches with Roman numerals on the dials. However, owners of watches with Roman numerals might have noticed something weird, something rather unusual. While the numeral 4 is commonly written IV in the Roman numeric system, most watches rely on the typography IIII. And of course, just like us, you might have asked yourself why? As always, there is no single answer to a problem, but here are some possible explanations for this absurdly important question.

The Roman numeric system isn’t widely used anymore. Most of Western countries rely on Arabic numerals, Asian countries have their own numeric system and Arabic culture uses a typography that is different from the classical Arabic numerals. However, in watchmaking, Roman numerals have been used and are still in use on multiple dials.

Owners of antique pocket watches or of modern Glashütte Original, Lange, Ulysse Nardin, Blancpain, Cartier or even Rolex watches might have noticed that the 4th numeral on the dial, the one indicating 4 o’clock, isn’t written in the traditional Roman way. While the 4 is commonly written IV, the dials of our watches and clocks rely, most of the time, on a surprising IIII representation. Of course, there are exceptions to the rule as, for instance, Big Ben in London. However, on most dials, 4 o’clock is depicted with IIII.

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An exception to the rule, London’s large clock Big Ben relies on the numeral IV

It’s now time to try to find an answer to this crucial question (irony mode on)… Jokes apart, even though it won’t change the face of the world, it is interesting to understand why the watchmaking world almost unanimously decided to switch to the number IIII instead of the more common number IV. As always, such a question won’t lead to a single and definitive answer, but here some of the possible explanations we found.

IIII was the earliest way to write 4

Commonly, Roman numerals are written this way: I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII and so on. Roman numerals originated in ancient Rome, approximately 1000BC, and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages, long after the decline of the Roman Empire. It’s only around the 14th century that Roman numerals began to be replaced by modern (and easier to use) Arabic numerals. Numbers in the Roman system are represented by combinations of letters from the Latin alphabet. The decline of Roman numerals coincides with the decline of Latin and the emergence of the Renaissance.

Grand Central Station, NYC – IIII to mark 4 o’clock.

However, even though it is now widely accepted that 4 must be written IV, the original and most ancient pattern for Roman numerals wasn’t the same as what we know today. Earliest models did, in fact, use VIIII for 9 (instead of IX) and IIII for 4 (instead of IV). However, these two numerals proved problematic, they were easily confused with III and VIII. Instead of the original additive notation, the Roman numeral system changed to the more familiar subtractive notation. However, this was well after the fall of the Roman Empire.

The first mechanical clocks were created in Europe during the 13th century at a time when Roman numerals were still in use – in addition to that, most clocks were mounted on churches, and Latin was the official Catholic language. It thus makes sense for most of the ancient clocks to feature Roman numerals on their dials. However, the reason why clockmakers chose to use IIII instead of IV when this representation wasn’t in use, remains unclear.

An offence to Jupiter

While Romans didn’t make it to the mechanical clock, they had adopted the concept of the sundial, based on shadow clocks from ancient Babylonian astronomy (around 1500BC). We must not forget that watchmaking is a child of astronomy. For this reason, multiple sundials were found in Rome and in Romans’ pockets – yes, the pocket-sundial… Some antique sundials have been found featuring Roman numerals engraved. Again, some featured IV, some featured IIII.

An antique coin (Roman Empire) depicting Jupiter – or should we say IVPPITER.

One of the reasons why IIII was used at that time could be explained by Roman mythology. Back then, Rome’s supreme deity was Jupiter,  god of the sky and thunder and king of the gods in Ancient Roman religion. In Latin, Jupiter was spelt IVPPITER. As you don’t mess with gods, Romans might have felt hesitant to engrave part of their supreme deity’s name on a sundial or printed in books. This is why the number IIII, even though inconvenient, might have been prefered over IV. While sundials had become obsolete with the advent of watchmaking, the number IIII might have been used just for the sake of tradition.

Easier for the average non-educated citizen

Even though the subtractive notation is now widely accepted for Roman numerals, its use came gradually and early clockmakers might still have had the choice of whether or not to use or not to use IV. As we mentioned, primitive clocks were mounted on top of churches as the unique place where time was indicated in a city.

We have to remember that back in Ancient Times and the Middle Ages, only a small portion of the population was able to write, read and calculate. This might be a way to explain the use of IIII instead of IV. While IV requires some maths – basic maths, you’ll agree, for us educated people, but certainly, something that was too complex for the average, non-educated farmer living in France or Germany in 1650.

The numeral IIII might have remained in use because it was easily recognisable as four – the additive notation might have been easier for a large portion of the non-educated European population. The majority of people weren’t literate or numerate and a simple subtraction was probably too complex for them. Also, this might have implied confusion between IV and VI, as well as between IX and XI. This is why on some clocks nine is represented by VIIII.

The lazy clockmaker

One hypothesis we came up with is that of the “lazy clockmaker”… One that we don’t really take seriously. While this doesn’t apply to clocks with cut-out or painted numerals if the numerals were cast in metal having IIII instead of IV and VIIII instead of IX could have made the clockmaker’s life slightly easier.

If you rely on the additive notation, you’ll end up with these numerals: I, II, III, IIII, V, VI, VII, VIII, VIIII, X, XI, XII. This means that you can create fewer moulds, as you’ll use the same basic mould for the four first numerals and the same basic mould for the numbers from VI to VIIII. Only three moulds would be required: a first one shaped like IIII that was partially filled to create the numbers I, II, III and IIII, a second one shaped like VIIII used to create the numbers V, VI, VII, VIII and VIIII and a last one shaped like XII, used to cast the number X, XI and XII.

Orsay Museum (previously a train station), Paris – Here again, 4 o’clock is depicted by IIII

Having a dial relying on the more classical I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII style would have required extra moulds… Admittedly, not the most convincing theory.

Louis XIV “the Sun King”

A more modern theory involves French King Louis XIV. Just to give you an idea of his modesty, this French monarch was nicknamed Louis le Grand (Louis the Great) or Le Roi Soleil (The Sun King). One of the most powerful French monarchs, he consolidated a system of absolute monarchical rule in France with the whole political and religious system revolving around his figure – the concept of the divine right of Kings, creating a centralised state which would later lead to the French Revolution (under Louis XVI).

For the same reasons as Jupiter wouldn’t want two letters found in his name to be written on a sundial, it could have been possible that not-so-modest King Louis XIV preferred IIII over IV to be used in clocks. Being the representation of God on Earth, a part of his name couldn’t be printed on the dial of a simple clock.

However, this theory seems quite implausible. The use of IIII existed in multiple areas already and under the reign of many different monarchs whose names didn’t contain the letters IV. This doesn’t seem to be a sufficient explanation to reject the subtractive notation.

The visual Balance

The last possible explanation is the most rational of them all – and thus, probably the most plausible too. Commonly, clocks and watches display time on 12 hours. 12 numerals are thus printed on their dials. One of the reasons for the use of IIII instead of IV could easily be to obtain a greater visual balance.

The IIII numeral, more complex than the usual IV numeral, might provide better visual balance to the complex VIII found on the other side of the dial.

Most modern or vintage watches and clocks rely on a mix of additive notation and subtractive notation (where the 4 is IIII and the 9 is IX). This way, the dial features the following numerals: I, II, III, IIII, V, VI, VII, VIII, IX, X, XI, XII. With this combination, you obtain three identical areas on the dial, each of them using the same kind of numerals. The first third only uses I, the second third is the only one using the V and finally, the last third is the only one featuring numerals with X. This way, you’re balancing the dial with three distinct areas, creating a more elegant and harmonious dial.

The dial of this Cartier relies on three distinct thirds – I, II, III and IIII – V, VI, VII and VIII – IX, X, XI and XII.

Also, in the same vein, the numeral IIII is easier to read than the numeral IV, especially when it is upside down, as often on modern watches – where Roman numerals are applied or printed radially (pointing to the centre of the dial).

Still, not one definitive answer, but a mix of traditions, ancient practices and practical reasons might explain why the watchmaking industry still, today, relies on the use of IIII on most of the dials featuring Roman numerals. And of course, there will always be exceptions to the rule…

H. Moser & Cie. is one of the few modern watchmakers to use IV on its dials. But as you can see, the numerals on the lower side of the dial aren’t upside down either

25 responses

  1. Very informative! I’d never heard of the Louis XIV theory before.

  2. Magnifique ! What an informative and fun article to read! Thank you Brice! Thank you Monochrome. My favorite blog by far

  3. The grouping of the numbering of clocks in three sections I, II, III, IIII / V, VI, VII, VIII / IX, X, XI, XII with the I s, V s, and X s together also brings to mind the Holy Trinity of the Father, Son, and Holy Spirit for French Catholics.

  4. Most interesting is the cost and ease argument for clock makers using casts and molds for their parts. What this excellent article has missed is that the mold for IX can be turned upside down to give XI (and save effort and money) but this is not possible for IV. That is to say using IX for 9 saves money and time but using IV for 4 does not. So the cost of casting argument is actually stronger than presented here. As pointed out the cast for IIII can be used to produce I, II, and III as well as IIII.

  5. Yes you can use the mould of VI for IV. Just mirror it not upside down but left to right (horizontally). 🙂

  6. I was told that it was because George III was presented with a clock with the classic Roman IV as 4, but he said that it was wrong, & insisted that it should be IIII, & as nobody dared correct the King lest they incurred his wrath, they accepted his authority!

  7. The numeric value of “V” does not exist until you have reached I+I+I+I+I.
    Therefore, the ancients could not have “IV” prior to “XIV”.
    Likewise with “9” and “VIIII” and “XIX”.

  8. I heard of another explanation. By using IIII it turns out that one needs exactly 20 I’s, 4 V’s and 4 X’s. This requires setting up a mould with 5 I’s, 1 V and 1 X and using it 4 times to complete a quadrant. You cannot do the same with IV.

  9. I was told that a particular clock was commissioned by a king, who wanted it to be perfect and like no other, the clock was made and made with the 4 as IV, the king said that is wrong and not perfect, it is IIII, so the clock maker lost his head, in truth the king didn’t want the clock maker making any clock as grand as the one the king had made. This was told to us in school.

  10. Big Ben is a bell. Your illustration is of the clock on the Victoria Tower.

  11. Actually, the lazy (and smart) clockmaker option is likely the better of the lot. The way the author describes the moulds would lend credence to his opinion and if the moulds were made as he envsioned, I would agree with him.

    However, that’s not how moulds work. Pascal’s principle explains this clearly. (i.e. a mould for a I I I cannot be used for a I I or I) Remember a mould is poured at one spot and the liquid runs through the entire mould till it’s filled.

    However, considering the materials availble in the time period most clockmakers made clocks and also those who wanted clocks made like royalty and rich people, I think that they would create as few molds as possible yet small enough to be workable.

    I would think they had only one mold that looked like so : X V I I I I I . Using I I I I instead of IV allows the casting of this mold only 4 times to not only give the least number of pours but also, and likely the most important, least amount of waste. (pouring this mould 4 times gives the exact number of symbols to make one clock) This is important as the raw materials used to make clocks then were likely of more malleable materials such as gold, silver, copper etc.

    So in conclusion, I don’t think it was laziness but actually good business practice that made clock makers to do this.

    Additionally, since many clock makers were artists, it’s highly likely they also liked the symmetry it gave the clock as given above and given the fact that the way to write roman numerals was not standardized, they could take certain liberties with their creations.

    My Reasons for debunking the others.

    – IIII being the original way of writing IV. Would this not apply to other numbers too? Like 9 could be written as VIIII.
    – King Louis XVIIII. Conceited for sure but there were clocks with IIII long before him and I doubt clock makers in countries outside France would adhere to anything he demanded.
    – Jupiter and that people might be offended. That’s like saying do not use the word GO as it might offend God. Additionally, most people didn’t know how to read likely had no interest in knowing the exact time.
    – People weren’t versed in Mathematics so they could not understand that IV meant 4. Yet somehow they did understand that IX meant 9?
    – Holy Trinity? Sundials were in existance way before that. Additionally, clocks were made all over europe not just in catholic France/Italy.
    – IV upside down is hard to read. But if you put the IV upside down you must also put VI upside down right?

  12. As a 21 year old in Rome, I came a cross a bridge where the number 4 was carved as IIII. In my youthful umbrage at how wrong that is, I suddenly realized that I WAS in Rome, and that they probably had a pretty good idea of what Roman numerals should be..😂 4 is also carved as IIII on the Vatican..

  13. Instead of giving a reply, I just want to ask a question
    : What is the right or standard orientations of the numerals, upside down or normal as I find it in the clock of H. Moser & Cie? Anybody will reply to this question as I purchased a clock which does not have upside down numerals. If it is upside down on the lower side of the dial like most of the clock and not normal (IV/IIII,V, VI etc) engraved in the dial. Will anybody enlighten me about it? I purchased a clock where I find the orientation is not upside down in the dial and if that is not the correct oriention I will return it.

  14. @Prof M.K.Nath – regarding your question, there’s no single answer. The orientation of the numerals is simply a design choice. Nothing more.

  15. Saying simple farmers would not understand IV as opposed to IIII is rather condescending. There is no reason that a farmer’s IQ should be lower than the average lawyer’s IQ in centuries past, as higher education was usually a matter of family prominance and wealth rather than scholastic merit, and a clock maker could have put a carving of a squirrel between the III and V and a 7yr old child would still know it’s representing the numeral 4.

  16. @ Paul Dickey: actually it’s the Elizabeth Tower, not Victoria. Slightly ironic that you were trying to correct the author of this article and ended up in the wrong yourself!

  17. So why wasn’t ‘9’ written as VIIII rather than IX ?

  18. From one of our readers:
    I wanted to point out that if you use IIII, you can mold the numbers using only one small mold. If you have a mold in the shape of VIIIIIX, you can make four copies, and because X and I are the same upside down cutting them up makes each number a single piece. Like this:
    V IIII I X

  19. Extending the theory, can it be possible that Serifs were created so that the metalsmith can mold the numerals and install them as one piece on the clockface? It would sure make it easier to install multiple numerals in a straight line.

  20. This was answered well by “Cecil Adams” in his “Straight Dope” column back in 1986:

    There’s no record of Ancient Rome ever using “IV” to denote the number four. However, the subtractive “IX” was the norm for nine. Why? Reasons. If it helps, consider that the 4 “I”s move along the usual illiterate scratches on a stick to count leading to groupings of five. We in the West still make four marks and then a slash through them to denote five which is much easier to group.

    There are no numerals or symbols other than that designating four which appear together without any other symbol denoting a higher level.. That is, “nine” wouldn’t be written as “VIIII” because there’s a leading numeral which differs. Not so with four.

    There may also be something to the comment about casting from “Brice Goulard” which allows for a single group of four moulds to cast all the necessary digits. Unfortunately, numerals were much more likely to be found scratched on slate, limestone/marble, wood , and clay than they were to be cast in ANY metal.

    No preceding numeral symbols, follows the æons-old hiistorical scratching of marks, primarily by shepherds and other livestock holders (and later, granaries).
    “The fact is you’ll be hard-pressed to find CONTEMPORARY uses of “IV” anywhere in the Roman Empire well past the arrival of the Vandals.

  21. This is historic stuff. But electronic watches are now the rave


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