Patek Philippe
Complications 5110J-001— lug 18mm

The lug width (misura ansa) of the Patek Philippe Complications 5110J-001 is 18 millimetres. This measurement is specific to the model and must be verified using a calliper positioned perpendicularly between the two lug pins, measuring their internal distance. Using a strap with a different lug width would compromise both the strap and the case.

For a Complications 5110J-001 in yellow gold, straps in alligator with vegetable tanning in dark brown, mahogany brown or black tones are recommended. Alligator echoes the geometric sophistication of the dial and ages beautifully. High-quality alternatives include vegetable-tanned calf (soft and practical for daily wear) and shell cordovan (exceptional durability and elegant ageing). The choice depends on intended use: alligator for formal elegance, calf for frequent wear, cordovan for longevity.

To change the strap, a dedicated spring bar remover tool is required. Position the watch with the case facing upward, insert the tool into the thin gap between the case and lug, press lightly to release the internal spring inside the pin, then extract the lug and remove the old strap. This operation requires care to avoid scratching the case. If inexperienced, consult a jeweller or specialised atelier such as Casati Milano.

Yes, any strap with an 18-millimetre lug width is compatible with the Patek Philippe Complications 5110J-001, provided it is of high constructive quality. Artisanal straps produced by specialised ateliers, such as those available in Milanostraps' 18mm collection, guarantee compatibility and longevity. It is essential to verify that the strap is made from noble leather (alligator, calf, shell cordovan, vegetable tanning) to respect the value and spirit of the timepiece.

The lifespan of a leather strap depends on the material, frequency of use and care. A quality alligator with vegetable tanning lasts 5 to 10 years in daily use; calf lasts 3 to 5 years; shell cordovan lasts 7 to 15 years thanks to its extraordinary resistance. Prolonged exposure to sunlight, water and perspiration reduces longevity. Casati Milano straps include an 18-month warranty against manufacturing defects, whilst natural ageing is part of the aesthetic beauty of noble leather.