Monochrome Watches
An online magazine dedicated to fine watches

The New Green IWC Big Pilot Perpetual Calendar

It's green... and it's also the first Big Pilot to ever come with EasX-CHANGE system.

| By Brice Goulard | 2 min read |

While all the attention was focused (rightfully so) on the return of the Genta-inspired Ingenieur watch during the Geneva watch fair, IWC actually had more watches to present… at least discreetly. We’ve covered already the new Top Gun Chronograph 41 in black and blue, but more pilot watches have been unveiled. And one of them goes big and green, just like we like it. Here’s the IWC Big Pilot Perpetual Calendar Green, and there’s a surprise on the back of the strap…

Know as the reference IW503608, this new model doesn’t reinvent the wheel, if you allow me the expression. It is, in fact, a new colour to an already existing model, the updated BP Perpetual that was introduced in 2021, with a blue dial, a steel case and a blue leather strap. And now, well there’s a green edition – following what IWC has done already with both the BP43 watch here and its more elegant collection, with two green Portugieser models.

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No major updates here, compared to the blue edition. The stainless steel case, a striking one measuring 46.2mm in diameter and 15.4mm in thickness, sticks with the Big Pilot’s Watch formula and is almost entirely brushed, with the only polished accents being the conical bezel and the caseback. Completing the look is a deeply knurled and oversized onion-shaped crown, which is screwed, just like the caseback, for 60m of water-resistance.

The main update on this new Big Pilot Perpetual Calendar IW503608 is the dial, or more precisely its colour. Dark green, with a sunray-brushed effect, it relies on the same design language as the green BP43 of last year. Just like the blue BP Perpetual, it relies on applied markers and hands that are rhodium-plated and largely filled with luminous material – legibility day and night is key for this collection. The display remains classic, and based on the QP module developed by Kurt Klaus. It indicates time centrally, with 4 subdials for the moon phase (for the northern and southern hemispheres) at 12, the date and power reserve at 3, the month at 6 and the weekday and small seconds at 9. Additionally, a 4-digit year indication is found at 7 o’clock.

Under the sapphire back is the large, powerful in-house calibre 52615, an automatic movement with 2 barrels and 7 days of power reserve. The new Green BP Perpetual comes on a matching green rubber strap with steel rivets, a folding clasp and the brand’s practical EasX-CHANGE system, to switch between straps effortlessly. Indeed, for the first time, this clever interchangeability device appears on a Big Pilot – meaning 22mm lug width – which certainly opens the door to future evolutions. Just note that, for the time being, this green rubber strap is the only one available.

Now available and not limited, the IWC Big Pilot’s Watch Perpetual Calendar Green IW503608 is priced at EUR 36,000 or USD 33,000. For more details, please visit

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