The 1000-Hour Power Reserve Haute-Rive Honoris Meccanica, with Fully Exposed Mechanics

Haute-Rive is a relatively young independent watchmaking atelier launched by Stéphane Von Gunten, previously the R&D Director of Ulysse Nardin, where he was involved with filing no fewer than 30 patents. Quite a background. The first watch created under his own brand was the Honoris, and it was a powerful release, to say the least. A watch boasting an impressive 1000-hour power reserve, it has since been refined regarding its design, replacing the fluted rotating bezel with a more discreet one. But it is time now for this beast of power to reveal its mechanical tricks, as Von Gunten presents the Haute-Rive Honoris Meccanica, exposing all its technical elements dial side. 

The length of the power reserve of a watch is often dictated by compromises. More energy storage means more barrels or longer mainsprings, and thus more space, which isn’t always compatible with the need for compactness. More energy storage also obviously means a more complex movement, often not off-the-shelf, and thus a higher final price. Finally, a longer power reserve requires longer mainsprings, which, in return for their capacity to store more energy, also deliver it less stably (higher torque that decreases more quickly), thus influencing the chronometric performance of the watch. Then again, technical solutions can counteract these issues (constant force, multiple barrels), but at a cost. This is why the industry standard for a mechanical wristwatch is an autonomy of 40 to 50 hours, even though the industry is gradually moving to a 3-day standard.

Having a longer power reserve offers tangible practicality and comfort, and 5 to 7 days is not uncommon. But, as with everything mechanical, watchmakers have taken great pride in surpassing these standards, and some have developed watches with exceptionally long power reserves. As listed in this article, several watchmaking companies have managed to go beyond a month. And this includes Haute-Rive and its Honoris model, boasting a staggering 1000-hour power reserve movement.

The Honoris debuted in 2023 and made possible this 41-day power reserve thanks to an unusual conception for the movement (not unlike a UN Freak), with a calibre fitted with one single barrel, housing a 3-meter-long mainspring integrated within a 35mm barrel drum machined directly into the main plate and covering almost entirely the back of the watch. Although the watch is manually wound, the outer end of the spring features a slipping bridle to avoid excess tension and protect the mechanism from overwinding.

Considering the extreme length and strength of this mainspring, the movement is hand-wound by rotating the fluted bezel (a classic crown would have been inadequate), and the watch also features a smart function selector (hence the push-piece on the side of the case) driven by a column wheel that allows you to set the time via the crown without pulling it out.

Now, there’s a new version of the Haute-Rive concept, the Honoris Meccanica. Using the same overall design and conception of the inaugural model, it now exposes all its mechanical beauty on the dial side. The case, which benefits from the revised bezel of the first models (the fluted bezel was quickly replaced), is made in white gold and measures 42.5mm in diameter, paired with a surprisingly reasonable thickness of 11.95mm (not something you expect from such a powerful watch). All three variants are worn on a hand-stitched leather strap with a pin buckle.

What changes with the Honoris Meccanica is that the movement is no longer hidden behind a dial, but becomes the dial itself. The three-dimensional architecture reveals a radiating structure at the centre of the watch, organised around the HR monogram. The gears and wheels of the movement, the column wheel and its levers, the keyless work… everything participates in a more radical and technical look for the watch. On top, suspended above this architecture, the blued hands rotate above the mechanics. And, at 6 o’clock, the one-minute tourbillon seems to be mysteriously floating over the dial. Its variable inertia balance beats at a slow 2.5Hz frequency.

The Honoris Meccanica is available in three interpretations:

• Honoris Meccanica Rhodium – white gold with rhodium microblasted mainplate and blued hands
• Honoris Meccanica Ruthenium – white gold with ruthenium-coated mainplate and blued hands
• Honoris Meccanica Rosso – a bolder edition in white gold with ruthenium-coated mainplate, red anodised aluminium ring, microblasted rhodium-plated brass hands and red strap

The Haute-Rive Honoris Meccanica is available for order directly from the brand, but is produced at a confidential scale of about 10 watches per year. The Rosso edition is a strictly limited series of 8 watches. All versions are priced at CHF 158,000 (excl. taxes). For more details, please visit www.haute-rive-watches.ch.