Strap for Master Collection Worldtime Black

The lug width of the Longines Master Collection L2.631.4.51.5 is 20mm. This measurement refers to the distance between the interior edges of the lugs and is the fundamental parameter for selecting a compatible strap. It is essential not to confuse the lug width with the case diameter (39mm); the lug width exclusively determines the compatibility of the strap.

The strap most befitting the Longines Master Collection L2.631.4.51.5 is a black-dyed alligator with vegetable tanning, which emphasizes the formal identity of the watch and the soberness of the case. Alternatively, a cognac shell cordovan offers considerable personality and develops a noble patina over time. For daily and versatile use, a deer calf in chocolate brown or tobacco tones provides flexibility without sacrificing elegance.

The strap change is accomplished by removing the spring bars that connect the strap to the case. With a dedicated tool or small knife, press the spring bar from one side, extract it gently, then remove the old strap. The new 20mm strap is inserted by aligning the holes with the spring bars, then the bars are pressed back using the same reverse motion until fully seated. It is advisable to work carefully to avoid scratching the case.

Yes, any strap with a 20mm lug width is compatible with the Longines Master Collection L2.631.4.51.5. High-quality artisanal aftermarket straps often surpass factory-supplied ones in craftsmanship and materials; compatibility depends exclusively on the lug width measurement, not on the watch brand.

The lifespan of a leather strap depends on tanning quality, daily use, and maintenance. A high-quality leather with vegetable tanning, worn 5-6 days per week, lasts 3-5 years before showing significant wear; shell cordovan can last 6-8 years. Humidity, perspiration, and sun exposure accelerate ageing. Regular maintenance with specific balms extends the strap's life.