Strap for Master Collection Date 36 Stainless Steel

The lug width of the Longines Master Collection L2.518.4.78.3 is 19mm. This measurement represents the internal distance between the two case lugs and is determined by the proportion between the 36mm diameter and the case height. To verify compatibility, measure the distance between your case lugs: if it is exactly 19mm, you can choose from our compatible straps without risk of incompatibility.

For the Master Collection L2.518.4.78.3, we recommend noble leathers with uniform weave such as alligator or vegetable-tanned calf. Black alligator offers maximum formality and natural patina that develops over time. Chocolate brown calf maintains daily versatility. Cognac shell cordovan creates elegant contrast. The choice depends on your primary use: formal, daily-casual, or alternating between both registers.

To change the strap, you must remove the case lugs. Use a dedicated tool (spring bar tool) to push the lug from one side and slide it out of the seat. Repeat for the other end. Insert the new strap lugs into the case slots, ensuring the spring closes correctly. If you are not experienced, we recommend entrusting a Longines service centre or trusted watchmaker to avoid damaging the case.

Yes, aftermarket straps are fully compatible with your watch, provided they respect the 19mm lug width. A high-quality artisanal leather strap can actually improve the daily versatility of your Master Collection, allowing you to switch between formal and casual registers with ease. Ensure the lugs are the correct length and that the buckle or deployante is well-proportioned to the 36mm case diameter.

The lifespan of a leather strap depends on frequency of use, climate, and material. An alligator or shell cordovan strap, with ordinary maintenance (gentle drying after water contact, avoiding constant humidity), lasts 3-5 years of daily wear. Vegetable-tanned calf has similar durability. Our artisanal straps include an 18-month warranty against manufacturing defects. To extend lifespan, rotate between multiple straps and store them in dry environments.