Strap for Saint-Imier Chronograph

The lug width of the Longines Saint Imier L2.753.4.73.0 is 20 millimetres. This measurement is standardised across all modern Saint-Imier collection examples and is engineered for the proportions of the 39 mm case, ensuring optimal visual harmony between the lug and strap. Verification is straightforward: place a ruler between the inner sides of the two lugs on the case and measure the distance; the result must be exactly 20 mm to ensure compatibility with any aftermarket strap.

For the Saint Imier L2.753.4.73.0, noble leather solutions are recommended: alligator for formal and evening contexts, vegetable-tanned calf for a balance between craftsmanship and daily practicality, shell cordovan for those who appreciate finishes that develop natural patina over time. A NATO strap in dark grey or brown canvas represents an informal alternative that maintains the chronograph's sporting character. Choosing a deployante buckle increases comfort and protects the case from accidental scratches.

Strap replacement requires the use of a spring bar tool: insert the flat end of the tool into the small hole beneath the lug, apply gentle lateral pressure to compress the internal spring mechanism, and carefully extract the bar from its seats. Repeat on the opposite lug. To fit the new strap, align the holes and insert the spring bar into the seats, ensuring the bar is centred and fully seated. If you lack experience, consult a professional watchmaker: Casati Milano offers strap-change services with personalised guidance.

Yes, any strap with a 20 mm lug width is mechanically compatible with the Saint Imier L2.753.4.73.0. Ensure the strap has correct dimensions (100–110 mm from the centre hole to the extremities is the standard for horology) and that the holes align with the original spring bars. On milanostraps.it you will find a selection of 20 mm straps in various materials, customisable according to your colour and finish preferences.

The lifespan of a leather strap depends on the tanning method, usage conditions and maintenance. A quality vegetable-tanned strap, with regular care (monthly cleaning with a dry cloth, avoiding prolonged moisture), has an average life of 3–5 years with daily wear. Shell cordovan and high-grade alligator can last 5–7 years or longer thanks to fibre density. Alternating use with other straps and protection from humidity and direct heat significantly extend longevity. Casati Milano offers an 18-month warranty on bespoke straps and assistance for periodic maintenance.