Strap for Master Collection Date 29 Stainless Steel

The lug width of the Longines Master Collection L2.257.4.78.6 is 15 millimetres, a non-standard dimension that reflects the proportions of the 29-millimetre case. This width is smaller than the commercial standard of 16 or 18 millimetres and requires straps specifically cut to ensure proper fit to the case lugs.

Alligator leather represents the superior aesthetic choice, with its natural geometric grain and a patina that evolves over time. Vegetable-tanned calf leather offers versatility and initial comfort, whilst FKM rubber provides superior tactile performance in humid environments. The choice depends on intended use and personal preference for patina development.

To replace the strap, remove the spring bar pins using a dedicated tool (spring bar tool or pinner). Position the tool beneath the pin, apply gentle pressure inward to release the internal spring, then withdraw the old strap. Insert the new strap by aligning the holes with the lugs and push the pin until it clicks into position. Verify the strap is securely fastened before wearing the timepiece.

Yes, Milano Straps offers a collection of compatible 15-millimetre straps customisable in material, size, initials and stitching thread. Each strap is hand-crafted in Italy and compatible with the original case lugs. For bespoke requirements, Casati Milano atelier creates custom-made straps to individual specifications.

The lifespan of a leather strap depends on frequency of use, climate conditions and tanning quality. A superior-quality alligator or calf leather strap, used moderately, has a longevity of 5–8 years. FKM rubber offers greater resistance to atmospheric agents. Shell cordovan, owing to its density, can last 10–15 years with appropriate care.