Strap for Master Collection 40mm Power Reserve Stainless Steel / Blue / Alligator

The lug width (or strap width) of the Longines Master Collection L2.908.4.92.0 is 21 millimetres. This measurement is specific to this model and ensures balanced proportions with the 40-millimetre case. To verify strap compatibility, measure the distance between the two lugs protruding from the case: they must be exactly 21 millimetres apart.

For the L2.908.4.92.0, vegetable-tanned alligator with natural cotton stitching represents the most coherent choice: the natural grain dialogues with the satinised steel case and the patina evolves nobly over time. Equally excellent alternative is shell cordovan, offering superior density and durability. Brushed calf is recommended exclusively for formal office wear.

To change the strap, position the watch with the case facing upwards and locate the two protruding pins at the sides of the case. Using a small tool (spring bar remover, available from specialist retailers), push the pin from one side to extract it completely. Repeat on the other side. Insert the passants of the new strap into the holes and reinsert the pins, ensuring they are fully locked. The operation takes 2–3 minutes and requires no technical skill.

Yes, provided they strictly respect the 21-millimetre lug width and constructive quality proportionate to the watch. We recommend avoiding inexpensive straps in synthetic leather or low-grade hide, which would compromise the aesthetic integrity of the piece. Artisanal straps in alligator, calf and shell cordovan with hand stitching of elevated quality remain visually and tactilely coherent with the nature of the L2.908.4.92.0.

Durability depends on leather quality, usage frequency and maintenance. A strap in alligator or shell cordovan with vegetable tanning and artisanal stitching maintains structural integrity for 5–7 years of daily or frequent intense use, provided it is not constantly exposed to moisture and direct UV light. Calf, being more delicate, may require replacement within 3–4 years with frequent daily use. The natural patina that forms over time is an indicator of noble ageing, not deterioration.