Strap for Master Collection Calendar 36 Stainless Steel / Diamond / MOP / Bracelet

The lug width of the Longines Master Collection L2.503.0.97.6 is 20mm. This measurement corresponds to the distance between the lugs on the case and determines which strap is compatible. A 20mm lug width strap will fit perfectly without lateral play or excessive resistance during changes. You can verify it using a digital calliper, measuring from pin to pin on the inner surface of the case.

The choice depends on usage and personal preference. For understated elegance and versatility, dark brown alligator is the classic solution: the fine grain enhances the pure lines of the 36mm case. For those who prefer evolving patina, vegetable-tanned black calf leather delivers timeless sophistication. A deep blue NATO strap remains the ideal choice for robust daily wear. All three maintain the Master Collection's sober aesthetic without compromise.

Strap changes on this model are performed using straight pins (not spring bars). Position the watch with lugs facing upward. Using a pin remover tool or small screwdriver, gently push the pin towards the case interior until it emerges on the opposite side. Once the old strap is removed, align the new strap on the lugs and reinsert the pin. The operation takes minutes: the key is avoiding scratches on the case during the process.

Yes, all straps with 20mm lug width are mechanically compatible with this model. Aesthetic compatibility is more selective: premium leather straps (alligator, calf, shell cordovan) naturally align with the Master Collection's classical style. Avoid thick or ostentatiously decorated straps, which would compromise the understated elegance of the collection. A handcrafted strap in Italian or French leather remains the most respectful choice for the watch's aesthetic identity.

A quality leather strap worn daily has an average lifespan of 3–5 years before showing visible deterioration (wear, loss of lustre). With occasional wear (1–2 times weekly), durability extends to 6–8 years. Vegetable-tanned leather ages better than chrome-tanned, developing a pleasant patina. Alligator is more durable than ordinary calf due to fibre density. Storing the strap away from moisture and direct light extends its life: a cotton pouch is sufficient. Casati Milano atelier provides 18 months' warranty on bespoke straps, covering manufacturing defects.