Patek Philippe
Complications 5396G-012— lug 21mm

The lug width is precisely 21 millimetres, measured between the two sprung bars of the spring attachment. This dimension allows no approximation: straps of 19 or 21 millimetres cause mechanical instability and accelerated wear. Every Patek Philippe supplies this technical specification in the warranty documentation.

On a 38-millimetre case in white gold 18 carats, black alligator or vegetable-tanned calfskin represent the technically orthodox choices. Alligator maintains a visual texture that does not compete with the dial; calfskin develops a patina over time that dialogues naturally with the patina of the gold. Both require a deployante in matching gold or steel.

Changing the strap on a Complications requires a replacement spring bar suited to the case dimensions (21 millimetres). Self-servicing is not advisable: a certified Patek Philippe watchmaker can perform the change in minutes, preserving the spring's functionality and verifying alignment with the lugs. Casati Milano provides this service in-atelier by appointment.

Yes, provided it rigorously respects the 21-millimetre lug width. Aftermarket straps of artisanal quality, such as those produced by milanostraps.it and Casati Milano, are compatible and often develop more pronounced aesthetic character than original straps, owing to traditional tanning techniques and manually selected leather.

A quality alligator or calfskin strap, with ordinary maintenance, lasts from 4 to 7 years with daily wear. Lifespan depends on exposure to water, perspiration and temperature. A Casati Milano strap includes an 18-month warranty against manufacturing defects; ordinary wear is considered natural patina and is not covered. Strap replacement is possible at any time, preserving the original deployante.