Strap for Master Collection 42 Annual Calendar Stainless Steel / Blue / Alligator

The lug width of the Longines Master Collection L2.920.4.92.0 is 21mm. This measurement should be calculated perpendicularly between the attachment pins and determines the compatibility of aftermarket straps. Correct measurement eliminates the need for adapters or invasive case modifications.

The ideal strap for the L2.920.4.92.0 depends on the context of use. For formal environments, dark brown alligator, shell cordovan, or vegetable-tanned calf leather are recommended. The natural grain of these leathers enhances the brushed steel case finish. For semi-formal situations, honey or pearl grey tinted calf leather offers versatility whilst maintaining elegance.

The Master Collection L2.920.4.92.0 is equipped with a bayonet or straight pins, common in Longines models. To change the strap: place the watch on a flat surface, use a small tool or pin punch to compress the bayonet spring from underneath the lug, gently remove the pin, extract the old strap and insert the new one. The operation takes approximately 5 minutes without specialised tools.

Yes, any strap with a 21mm lug width is compatible with the L2.920.4.92.0, provided the attachment system is identical (bayonet or straight pins). Numerous options are available online in alligator, calf, cordovan and technical materials. Milanostraps.it offers customisable straps in precise sizing for this reference.

Durability depends on the quality of the leather and frequency of use. High-quality atelier alligator or shell cordovan resists 4-6 years in daily wear thanks to dense natural fibre. Vegetable-tanned calf leather has similar durability but develops visible patina. Exposure to sweat, moisture and temperature fluctuations accelerates ageing. Casati Milano guarantees 18 months on custom straps.