Strap for Master Collection Date 29 Stainless Steel / Blue - Diamond

The lug width of the Longines Master Collection L2.257.4.97.0 is 15 millimetres. This non-standard measurement is specific to the Master Collection women's models and corresponds to the proportional ratio between the 29mm case and the average feminine wrist size. To verify it, position a digital calliper from the case lugs to the opposite extremity of the lug.

Alligator represents the most natural choice for this dress watch, particularly in cognac, tobacco, or black finishes. Vegetable-tanned calf leather with irregular grain develops a patina over time, whilst smooth calf offers formal character. For daily versatility, silk NATO straps and vulcanised rubber retain the aesthetic balance of the 29mm case.

The strap is replaced using a removable spring bar tool or through a qualified watchmaker. Insert the tool's tip into the lug hole, gently push downward until the first strap end is released, then repeat on the other side. Insert the new strap by snapping the spring bars back into place. Consult a professional if uncertain of the procedure.

Yes, provided the strap is specifically manufactured for the 15mm lug width, particularly for this model or the Master Collection women's line. Always verify the retailer's technical specifications and ensure the strap ends are compatible with your case lugs. Milano Straps offers a dedicated collection of 15mm straps ready for dispatch.

A quality leather strap, in vegetable tanning or alligator, typically lasts 3–5 years with moderate daily use. Longevity depends on ambient humidity, frequency of wear, leather quality, and maintenance. Smooth calf straps tend to wear earlier, whilst alligator and cordovan offer superior durability. The Casati Milano atelier provides an 18-month warranty on bespoke straps.