Strap for Master Collection 47.5 Small Seconds Stainless Steel / Silver-Arabic / Alligator

The lug width of the Longines Master Collection L2.840.4.78.3 is 25mm, measured from the inner shoulder of one lug to the other. This is a non-standard measure, so any strap must be specifically designed for this width to avoid gaps or mounting difficulties.

The best material depends on usage: naturally-dyed alligator enhances formal elegance while maintaining the case's sporting character; vegetable-tanned calf develops noble patina over time; natural rubber ensures daily practicality. Shell cordovan represents absolute excellence for those seeking leather that improves with decades of wear.

Remove the strap by using a spring bar tool to lift the bars from beneath, loosening the tension. The strap will detach cleanly. To fit a new one, insert the bars into the lugs, lower the strap onto the case, and ensure the bars sit flush on both sides. This is straightforward but requires care to avoid scratching the case.

Yes, provided the strap is specifically engineered for 25mm lug width. Quality aftermarket straps respect the same construction tolerances as originals and ensure secure, comfortable fitment. Choose brands offering warranty and stainless-steel bars for maximum durability.

A high-quality leather strap (alligator, vegetable-tanned calf, shell cordovan) lasts 3 to 7 years with daily wear, depending on care and UV and humidity exposure. Regular maintenance—soft cloth cleaning, annual conditioning—significantly extends longevity. Rubber or fabric straps have comparable lifespan but require less maintenance.