Strap for Master Collection 40 Date Stainless Steel / Yellow Gold / Champagne-Diamond / Alligator

The lug width is precisely 21 millimetres. This measurement is specific to the L2.793.5.37.7 reference and requires bespoke-designed straps. To verify, use a calliper and measure between the lug holes (the seats where the strap attaches)—from outer edge to outer edge. Milano Straps offers a dedicated collection of 21mm straps compatible with this model.

Alligator leather is the natural choice, particularly in cognac brown or deep black, as its regular grain texture enhances the case's proportions without competing with the dial. Alternatively, vegetable-tanned calf leather develops a natural patina that evolves alongside the yellow gold case. For versatility, a silk-and-cotton NATO with discrete stripes offers a modern, practical solution, whilst an FKM rubber strap is ideal for casual wear without compromising build quality.

Remove the spring bars (the small pins connecting the lugs to the case) using a dedicated spring bar tool. Press the tool against the retention button on one side of each pin, then extract it carefully. Repeat on the opposite lug. Once removed, align the new strap with the lug holes and re-insert the spring bars, ensuring they click into position. To avoid scratching the case, consider having an authorised Longines service centre or Milano Straps change the strap for you.

Yes, absolutely. High-quality aftermarket straps—such as alligator, vegetable-tanned calf, or artisan NATO designs from Milano Straps—are fully compatible with the 21mm lug width. The key is selecting a strap that respects the case's proportions and matches the watch's build quality. A personalised, artisan strap allows you to vary your look whilst maintaining aesthetic coherence with the Master Collection.

Durability depends on material and usage patterns. A high-quality alligator strap with vegetable tanning typically lasts 5–8 years with regular wear and proper care. Hand-aged calf leather has similar longevity. Key factors include frequency of wear, humidity exposure, perspiration, and maintenance. Milano Straps provides straps with an 18-month guarantee and recommends avoiding prolonged water contact and applying protective cream every 6–12 months to preserve the leather.