Strap for Saint-Imier Chronograph

The lug width of the Longines Saint Imier L2.784.4.52.3 is precisely 20mm. This measurement represents the space between the two lugs of the case where the strap is inserted. To verify, use a digital calliper or ruler positioned inside the lug: the warranty card and original Longines manual confirm this constructive specification.

The ideal strap depends on usage: dark brown alligator amplifies the sporty-formal character of the chronograph; vegetable-tanned calf in cognac offers wear resistance and natural patina development over years; burgundy shell cordovan imparts rare chromatic depth. For sporty use, charcoal grey NATO cotton-polyester ensures versatility; black FKM rubber provides grip without formal compromise. A stainless steel deployante clasp is recommended to protect the case mechanism.

The strap is changed by extracting the spring bars that connect the strap to the case lugs. Use a dedicated spring bar tool to apply controlled pressure on the internal spring: the bar will retract, allowing downward extraction. For insertion, position the new strap, align the holes, and insert the bar by compressing the spring again until you hear a click. Avoid forcing to prevent damage to the stainless steel lugs.

All straps with a 20mm lug width are compatible with the L2.784.4.52.3, regardless of brand. Online you will find customisable artisanal straps in alligator, calf, shell cordovan, NATO, and FKM rubber with initials and stitching thread options. The Casati Milano atelier creates made-to-measure straps with personal leather selection and WhatsApp updates, guaranteeing perfect compatibility with the case and lug.

Durability depends on material: vegetable-tanned calf, with moderate-to-heavy use, maintains structural integrity for 4-6 years; shell cordovan, owing to natural leather resilience, lasts 6-8 years; well-maintained alligator endures 5-7 years. Quality FKM rubber reaches 8-10 years. Maintenance—quick drying after moisture exposure, periodic conditioning with natural balm—extends lifespan. Casati Milano offers an 18-month warranty on made-to-measure straps.