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

The lug width of the Longines Master Collection L2.673.4.71.6 is 21 millimetres. This is a fixed measurement representing the internal distance between the two lugs on the case. Accurate measurement using a calliper is essential for selecting compatible aftermarket straps, preventing gaps or excessive pressure on the case.

The optimal strap depends on intended use. For formal occasions, black or brown alligator represents the classic choice that enhances the elegance of the Master Collection. For daily wear, vegetable-tanned calf leather develops an evolving patina over time. For maximum versatility, shell cordovan offers legendary durability and shifting reflections. For sports and warm environments, an FKM rubber or nylon NATO strap maintains the technical functionality of the watch.

The strap is changed by removing the lug pins using a dedicated pin remover or small blade. Position the watch on a stable surface, locate the small hole on each side of the case where the pin enters, and gently push from the opposite side to extract it. Repeat for both sides, then slide out the old strap and insert the new one by aligning the holes with the pins, pushing until they click into place. Always use appropriate tools to avoid damaging the case.

Yes, absolutely. Quality aftermarket straps in alligator, calf, shell cordovan, or FKM rubber are fully compatible with the Master Collection L2.673.4.71.6, provided they respect the 21mm lug width. The stiffness and profile of the strap must allow natural adhesion to the case lugs. Specialist manufacturers such as Casati Milano offer customisable straps that fit perfectly to your case geometry.

A quality leather strap typically lasts 3-5 years with daily wear, depending on the leather type and maintenance level. Shell cordovan is the most durable, with potential longevity of 7-10 years. Alligator and vegetable-tanned calf last 4-6 years. Lifespan is influenced by sun exposure, humidity, perspiration, and cleaning frequency. A well-maintained strap, occasionally treated with specialist products, extends its operational life significantly.