Strap for Saint-Imier Chronograph

The lug width is precisely 20mm. This is measured from the outer edge of one lug to the outer edge of the other, perpendicular to the case. Only straps specifically sized for 20mm will fit this chronograph without play or forcing.

For this 39mm stainless steel case with silver dial and white gold applied indices, vegetable-tanned alligator in deep brown, black vegetable-tanned calf, or burgundy shell cordovan are recommended. Black FKM rubber is the most functional sports alternative. The choice depends on intended use: formal for leather options, sporty for rubber.

Obtain a spring bar tool and position the watch with lugs facing upward. Insert the bifurcated tip of the tool into the small holes beside the lug spring, gently compress the spring, and slide the old strap out from the lug. Repeat on the opposite lug, then slide the new strap into the same spaces, ensuring the spring returns to its natural position.

Yes, any strap sized for 20mm is compatible with the L2.753.4.52.3 case, provided the spring bar diameter is standard (typically 1.6mm or 1.8mm). Artisanal straps from milanostraps.it are specifically constructed for 20mm lugs and tested on Longines models. Always verify exact specifications before purchase.

A vegetable-tanned natural leather strap typically lasts 4-7 years of daily wear, depending on moisture and perspiration exposure. Shell cordovan is more durable and can last 8-10 years. Regular maintenance (cleaning, drying after water contact, conditioning with neutral creams) significantly extends strap lifespan. Loops and stitching age before the leather itself.