Strap for Master Collection 40 Moonphase Stainless Steel / Blue / Alligator

The lug width (ansa) of the Longines Master Collection L2.909.4.92.0 is 21mm. This measurement is taken between the two internal lugs of the case, from one attachment hole to the other. The measurement must exclude spring bars and include the case metal. This size is standard for the model and determines the compatibility of available watch straps.

The choice depends on the intended use. For formal occasions, Mississippi alligator in black or dark brown delivers maximum elegance and develops natural patina over time. For daily wear, Italian vegetable-tanned calf offers versatility and superior initial comfort. For informal or sport contexts, reinforced canvas NATO ensures practicality and durability. All materials must be available in the 21mm lug width.

The Master Collection L2.909.4.92.0 uses standard spring bars. To change them: place the watch on a soft surface, locate the small spring mechanism on the bar, apply inward pressure with an appropriate tool (spring bar tool or fine tip) and slide the bar outward. Once the first side is freed, repeat on the opposite side. Insert the new bar by aligning the holes and push until you hear a safety click. The process requires care to avoid scratching the case.

Yes, any strap with a 21mm lug width is compatible with the Master Collection L2.909.4.92.0. High-quality artisanal straps represent an excellent option for aesthetic and constructive customisation. It is advisable to choose straps of certified quality, as the stainless steel case deserves a matching in terms of materials and finishes.

The lifespan of a leather strap depends on the material, frequency of use, and exposure to environmental factors. High-quality vegetable-tanned alligator can last 4-7 years with regular maintenance (protection from standing water, drying after humidity). Calf, being more delicate, has an average lifespan of 2-4 years. Vulcanised rubber resists 3-5 years. Artisanal straps with an 18-month guarantee reflect the expected benchmark for durability and craftsmanship quality.