Strap for Saint-Imier Chronograph

The lug width is 20mm. This measurement should be taken with a digital calliper positioned perpendicularly to the spring bars, measuring from inner shoulder to inner shoulder, fully excluding the thickness of the spring bars.

Alligator in vegetable tanning is the primary choice: its natural grain and patina development create aesthetic harmony with the dial. Calf leather offers immediate softness and predictable ageing. Shell cordovan represents a luxury alternative with initial rigidity and lasting brilliance that emerges through patina.

Remove the watch. Locate the small hole on the inner lug shoulder (at 9 and 3 o'clock). Insert a spring bar tool or needle until it nearly contacts the spring bar. Apply gentle outward pressure to extract the spring bar. Repeat on the other side. Align the new strap with the lugs and reinsert the spring bars carefully.

Yes, provided it is a quality 20mm strap. Verify that the lug width measures exactly 20mm from shoulder to inner shoulder. Premium aftermarket straps in alligator, calf, or structured rubber offer aesthetics and durability comparable to originals, with extensive colour and finish options.

A quality alligator or calf strap typically lasts 3–5 years with daily wear, provided it is not exposed to prolonged moisture or direct heat. Vegetable-tanned leather ages more visibly but maintains structural integrity. Proper maintenance—occasional cleaning and protection from rain—significantly extends service life.