Strap for Saint-Imier Chronograph

The lug width of the Longines Saint-Imier L2.752.5.72.0 is 20 millimetres. This measurement corresponds to the distance between the two case lugs where the strap attaches. To verify with precision, use a digital calliper measuring from inside lug to inside lug. A 20 millimetre strap will fit perfectly without excessive play or insertion impediments.

The ideal strap depends on usage and context. For formal occasions, an alligator leather in dark brown emphasises the elegant character of the bicolour gold-steel case and blue dial. For daily versatility, vegetable-tanned calf in cognac tone creates aesthetic continuity and develops patina over time. A NATO strap in cotton or cordura in grey or navy blue offers a contemporary sports option. Vulcanised rubber is ideal for environments with humidity or chlorine exposure.

Use a sprung bar tool or a thin, sturdy needle. Place the watch on a soft surface with the lug side facing upward. Locate the pin securing the strap: insert the tool into the small lateral hole on the lug and press gently towards the case centre to release the spring. The pin will disengage. Repeat on both sides. For installation of the new strap, align the holes and press the pin until it clicks into position.

Yes, any strap constructed for a 20 millimetre lug width is perfectly compatible with the Saint-Imier L2.752.5.72.0. Compatibility depends solely on lug width, not on the watch brand. Always verify that the strap is designed for 20 millimetres and that the material thickness does not exceed normal tolerances (approximately 3–4 millimetres), otherwise it may create friction inside the lug during wrist movement.

Durability depends on material, usage and maintenance. A quality alligator strap, with moderate daily wear, maintains aesthetic functionality for 4–6 years before requiring regeneration or replacement. Vegetable-tanned calf has a similar lifespan, but the patina it develops becomes more interesting over time. Vulcanised rubber lasts 2–3 years under normal conditions. Avoid prolonged exposure to excessive humidity, chlorine and corrosive perspiration. Periodic maintenance (cleaning with a damp cloth, occasional conditioning) significantly extends useful life.