Strap for Master Collection 41 Retrograde Moonphase Stainless Steel / Silver-Roman / Alligator XL

The Longines Master Collection L2.738.4.71.5 has a lug width of 20mm. This measurement is taken from the interior of one lug to the interior of the opposite lug, excluding the curvature of the case. The 20mm width is the standard for wristwatches in this diameter category, offering a wide selection of compatible straps without aesthetic compromise.

We recommend an alligator strap in dark brown with vegetable tanning or a shell cordovan with natural aging potential, both capable of enhancing the silvered dial and refined proportions. For daily use and versatility, vegetable-tanned calf leather in warm tones (cognac, tobacco) offers durability and natural patina development. For casual contexts, a military-style NATO or FKM rubber with deployante clasp provides practicality without sacrificing elegance.

The Longines Master Collection uses standard spring bars for strap attachment. Using a dedicated spring bar tool, gently press the internal elastic pin from the lug to release one end of the strap, then withdraw completely. Insert the new strap by aligning the holes with the pins, then secure by pushing the pin until it clicks. Work carefully to avoid scratching the case.

Yes, quality aftermarket straps with 20mm lug width are fully compatible. The Master Collection accepts any strap with holes aligned to 20mm width and using standard spring bars. Verify that the strap is not excessively thick, as this could compromise the overall aesthetics of the model. Artisanal premium leather, rubber, and fabric straps guarantee superior quality compared to generic alternatives.

A quality leather strap has an average lifespan of 2–4 years with daily use, varying based on climate, sun exposure, and maintenance. Premium leathers such as alligator, shell cordovan, and vegetable-tanned calf age elegantly, developing patina and character. To extend lifespan, rotate the strap with at least one alternative option and protect from excessive moisture and direct heat. Casati Milano's bespoke atelier provides an 18-month warranty on custom straps.