Strap for Saint-Imier Chronograph

The lug width of the Longines Saint-Imier L2.753.4.73.6 is 18 millimetres. This measurement is determined by the internal distance between the two lug bars situated on the case at 12 and 6 o'clock positions. To verify correctly, measure with a calliper the distance between the inner centre of one lug and the other. An 18mm strap fits perfectly without lateral play, ensuring the original aesthetic proportion of the case.

For the Saint-Imier L2.753.4.73.6, the optimal strap is alligator leather with vegetable tanning, in cognac or tobacco tones. Alligator reflects the sporty-classical nature of the watch and dialogues with the brushed finish of the stainless steel case. Alternatively, shell cordovan in mahogany tone offers natural patina development over time, whilst intense black alligator amplifies the formal character for evening wear. The strap must be 18mm wide to ensure correct coupling with the case lugs.

Strap replacement requires a spring bar tool. Position the watch on a soft cloth to protect the case. Insert the forked end of the spring bar tool into the vertical slot of the anchor pin, applying gentle downward pressure to compress the internal spring. The pin will retract, allowing you to remove the strap end from the lug. Repeat for the other side. To fit the new strap, align the pins with the lugs and insert in place, ensuring the strap is centred on the case.

Yes, the Longines Saint-Imier L2.753.4.73.6 is fully compatible with aftermarket straps, provided they have an 18mm lug width. Numerous specialist manufacturers offer straps in alligator, calf leather, shell cordovan and other materials that fit perfectly with the case lugs. Using aftermarket straps does not compromise the original watch warranty and allows for personalisation according to your preferences. For professional changes or bespoke work, it is advisable to consult specialist craftspeople who can personalise initials and stitching style.

The lifespan of a leather strap depends on the material, frequency of wear and care. Quality alligator or calf with vegetable tanning typically lasts 3–5 years with moderate daily use. Shell cordovan, being more durable, can reach 5–7 years. Longevity increases significantly if the watch is not worn daily or if the strap is protected from excessive moisture and direct sunlight. Vegetable-tanned leather develops natural patina over time, improving aesthetically even as it ages. Bespoke straps with superior stitching integrity maintain structural integrity longer than mass-produced alternatives.