Strap for Master Collection Date 38.5 Stainless Steel Black

The lug width of the Longines Master Collection L2.628.4.51.5 is exactly 20 mm. This measurement, standard for cases with a 38.50 mm diameter, indicates the distance between the two internal attachment points of the case. To verify it, measure from the base of one lug to the other using a calliper, ensuring you capture the seating space for the strap, not the external visible width. Accurate measurement is essential for purchasing compatible straps online or from specialist ateliers.

The Master Collection, with its silvered dial and stainless steel case, pairs ideally with straps in medium brown alligator, vegetable-tanned calf in dark tones, or shell cordovan. For formal occasions, black alligator is the most conservative choice. If you seek everyday versatility, brown calf that develops patina over time will offer an organic texture that contrasts pleasantly with the geometric rigidity of the case. For sporty wear, a rubber or NATO fabric strap provides practicality without compromising the watch's elegance.

The strap is changed by removing the spring bars that connect the strap to the case lugs. Position the watch on a soft surface, use a specialised tool—a spring bar tool or fine needle—to gently push the bar inward and slide the old strap out of the lug. Insert the new strap into position, reattach the spring bar. If you lack experience, a professional watchmaker can perform the operation in minutes at minimal cost.

Yes, the Longines Master Collection L2.628.4.51.5 is fully compatible with quality aftermarket straps in 20 mm width. Numerous online producers and luxury ateliers offer bespoke straps in noble materials—alligator, calf, shell cordovan—specific to this lug width. It is essential to verify that the width is exactly 20 mm and that the length (measured between stitch points) is appropriate for your wrist. Choose materials that respect the Swiss construction quality of the watch.

The lifespan of a leather strap depends on the material and usage. A good-quality alligator strap, if properly cared for, can last 3–5 years of daily wear before replacement. A vegetable-tanned calf wears faster (2–3 years) but develops a fascinating patina over time. Shell cordovan is exceptionally durable and may last 5–7 years. To extend strap life, avoid direct water exposure, protect from intense heat sources, and consider rotating multiple straps to distribute wear evenly.