Strap for Master Collection Chronograph 40 Stainless Steel / Silver / Strap

The Longines Master Collection L2.629.4.78.3 features a lug width of 20 millimetres. This measurement is the standard for high-end Swiss dress watches and is compatible with all handcrafted straps manufactured to this specific size. To verify compatibility, measure the distance between the lugs using a calliper or flexible ruler: the result must be exactly 20mm.

For the Master Collection L2.629.4.78.3, we recommend alligator leather in dark brown or black: the regular texture and natural patina create a perfect aesthetic dialogue with the stainless steel case. Alternatively, vegetable-tanned calf leather offers daily versatility whilst maintaining formal elegance. Shell cordovan is ideal for those seeking a luxurious, long-lasting finish that develops character over time.

Changing the strap on the L2.629.4.78.3 requires a Spring Bar Tool: insert the tip of the tool into the small hole beneath the lug, apply gentle pressure to retract the internal spring, then extract the metal pin. Repeat for both sides, then position the new strap by aligning the lugs with the holes and engaging the spring bar until it clicks. If you prefer to avoid risk, entrust the task to a professional service.

Yes, the L2.629.4.78.3 is fully compatible with 20mm aftermarket straps. The universal lug width allows you to choose from artisanal materials: alligator, crocodile, calf, shell cordovan, rubber and textile fabrics. Customisable straps ordered online guarantee precise measurements and bespoke finishing, whilst the Casati Milano atelier offers made-to-measure tailoring by appointment.

The lifespan of a leather strap depends on material type and usage: quality alligator or shell cordovan lasts 3-5 years with regular maintenance; vegetable-tanned calf resists 2-4 years. Durability is determined by wearing frequency, ambient humidity, sun exposure and leather care. Periodic maintenance with specialist products significantly extends the strap's lifespan.