Strap for Master Collection 38.5 Day Date Stainless Steel / Silver-Diamond / Alligator

The lug width of the Longines Master Collection L2.755.4.77.3 is 20 millimetres. This dimension is measured by placing a calliper from the centre of the left lug pin to the centre of the right lug pin on the case. Compatible straps must be exactly 20 mm in width at the lugs to ensure a secure and proportionate fit.

The best strap depends on intended use and personal preference. For formal occasions, alligator in brown or cognac tones represents the classic choice. Shell cordovan offers a natural patina that improves with time. Vegetable-tanned calf leather is ideal for those seeking simplicity and authenticity. For sportier versions, cotton satin NATO or marine-grade elastomer maintains comfort without compromising elegance.

Changing the strap requires a specific tool (spring bar tool) and precision. Position the watch with the strap facing upward, insert the tool into the tension spring slot of the pin, release pressure slightly and extract the pin from the case. Repeat the operation on the other side. When mounting the new strap, ensure both pins are fully inserted and that the spring catches correctly. If inexperienced, consult a professional watchmaker.

Yes, it is completely compatible with quality artisanal aftermarket straps, provided the lug width is exactly 20 mm. Specialist strap manufacturers offer premium leathers (alligator, shell cordovan, vegetable-tanned calf) and finishes specifically constructed for Longines watches. Compatibility is guaranteed by the standardisation of pins and case dimensions.

A quality artisanal leather strap, made with premium materials such as alligator or shell cordovan and natural tanning, has a lifespan of 5-8 years under daily-use conditions. Longevity depends on sun exposure, humidity, frequency of use and maintenance. Vegetable-tanned leather straps develop a natural patina that imparts aesthetic appeal over time. With periodic care (gentle cleaning, moderate humidity exposure), the lifespan can extend significantly.