Strap for Annual Calendar Chronograph 5905 Stainless Steel / Green / Bracelet

Not in the conventional sense. The bracelet is integrated directly into the case: there are no standard lugs to attach an off-the-shelf strap. For anyone wishing to switch to leather, the only proper solution is a bespoke attachment, built from the actual geometry of the case. I do this in the atelier, with the watch in front of me.

I work by appointment only, at <a href="/pages/casati-booking">Casati Milano</a>, Via XX Settembre 15, Milan. When you come in, I take the measurements directly from your case — no templates, no guesswork. Every attachment is hand-shaped and assembled to ensure a visual continuity with the steel of the case, as though it had always been that way.

For a piece with a sporting character but serious technical depth, I favour natural, unvarnished shell cordovan, or a brushed-finish deerskin calf. Both hold up to daily wear, age with integrity, and sit naturally alongside the satin-brushed and polished steel. I steer clear of heavily patinated or glossy leathers — on this watch they would simply look wrong.

A strap built on quality hide, with reinforced stitching and proper lining, will easily last five to seven years of regular wear — longer if you rotate it. Leather is not something to be afraid of; it just needs respect. Keep it away from prolonged exposure to water and condition it occasionally. Over time it develops a character that no new strap can replicate.

Yes, and I say that with conviction. Patek Philippe has never been a sporting manufacture in the strict sense, and introducing a flyback chronograph with annual calendar in steel, on an integrated bracelet, in 2015 was a bold decision. This is not the usual Complications in gold on an alligator strap. It is a watch that wants to be worn every day, while carrying inside one of the most refined complications the manufacture produces.