Strap for Master Collection 38.5 Day Date Stainless Steel / Black-Roman / Alligator

The lug width (ansa) of the Longines Master Collection L2.755.4.51.7 is 20 millimetres. This width is measured between the two lateral lugs of the case and corresponds to the space where the strap is inserted. It is a non-standard size, requiring bespoke artisanal straps as mainstream manufacturers do not reliably cover this width specification.

The optimal choice depends on intended use and aesthetic preference. For formal contexts, dark brown or navy alligator is recommended, alternatively bordeaux shell cordovan for evolved patina development over time. For casual use and water resistance, grained calf or natural rubber maintains both elegance and practicality. The watch's blue solaris dial harmonises exceptionally well with brown, navy and black straps. Milanostraps.it offers full customisation: material, colour, thickness, and stitching thread selection.

The strap is changed using a spring bar tool to extract the lateral pins from the case lugs. Position the tool beneath each pin, apply gentle inward pressure to release tension, then withdraw the pin outward. Repeat for the second pin. Insert the new strap by aligning the holes to the case lugs and reinsert the pins until they are fully secured. The operation requires approximately 5 minutes for experienced users. If you are unfamiliar with the procedure, we recommend having a professional watchmaker perform the replacement.

Yes, absolutely. A high-quality artisanal aftermarket strap is not only compatible but often superior to factory stock in terms of material quality, comfort and longevity. Milanostraps.it and the Casati Milano atelier produce 20mm straps specifically tested on the L2.755.4.51.7. It is essential to verify that the width is exactly 20 millimetres to prevent mechanical play or damage to the lugs. Compatibility is guaranteed by this precise measurement.

Longevity depends on material type and usage intensity. Artisanal alligator or shell cordovan lasts 5-8 years in daily wear, developing progressive patina that increases aesthetic value. Vegetable-tanned calf lasts 3-5 years. Rubber straps last 4-6 years. Maintenance practices—periodic cleaning, drying after moisture exposure, occasional leather conditioning—significantly extend lifespan. Straps produced by Casati Milano include an 18-month warranty and post-purchase maintenance guidance.