Strap for Perpetual Calendar Chronograph 5971 Emerald

The lug width of the 5971/13P-010 is 20 millimetres. This specification is standard across all examples of this line, regardless of case material (platinum, yellow gold, rose gold). To verify accurately, position a calliper or millimetre ruler between the lugs parallel to the case.

For the Grand Complications 5971/13P-010, we recommend Mississippi alligator or African Nile alligator (understated natural texture), vegetable-tanned calf (patina develops over time) or shell cordovan (sartorial density and lustre). Each choice must respect the dial and case finish, without visually competing with the complications.

Strap replacement requires: 1) soft rubber pad to protect the case, 2) spring bar tool for extraction, 3) precision when pressing the release mechanism to disengage the elastic pins. We recommend entrusting the operation to an expert if the case is platinum, to avoid permanent scratches on this delicate alloy.

Yes, provided the strap has a 20 millimetre lug width and the pins are of the correct diameter (typically 1.8 mm for Patek Philippe). A quality artisanal strap allows personalisation of the look without compromising the collectible value of the watch, provided it is made with noble materials and rigorous construction techniques.

A quality artisanal alligator or calf leather strap, with proper maintenance, lasts 3 to 5 years of regular wear. Longevity depends on UV exposure, humidity and frequency of use. A shell cordovan strap has superior durability (5-7 years) due to fibre density. Casati Milano offers an 18-month warranty on manufacturing defects.