Strap for Elegant Collection Automatic 39 Stainless Steel / Black / Bracelet

The lug width of the Longines Elegant L4.910.4.57.6 is 20mm. This is the standard width for watches with case diameters between 37 and 40mm. To verify compatibility, insert a digital calliper between the spring bar pins: the measurement must fall between 19.8 and 20.2mm. Do not use 19mm or 21mm straps, as the manufacturing tolerance is narrow.

We recommend genuine alligator straps for formal occasions on the L4.910.4.57.6, thanks to their well-defined quadrangular scales that complement the watch's sober elegance. For daily wear, vegetable-tanned calf develops a mature patina over time. If you seek extraordinary durability, shell cordovan is the premium choice. For a contemporary style, a rubber strap with fine texture in grey or navy blue transforms the watch into a modern instrument.

The Longines Elegant L4.910.4.57.6 uses spring bars to attach straps. Position the watch with the lugs facing you, use a spring bar tool to compress the spring inside the first lug, and remove the old strap. Insert the new strap ensuring both ends of the spring bar click into position. Verify the strap is secure before wearing the watch.

Yes, any strap with a 20mm lug width is compatible with the Longines Elegant L4.910.4.57.6. On milanostraps.it you will find a selection of handcrafted 20mm straps ready for shipment, made in alligator, calf, shell cordovan, and rubber. The important thing is to verify that the lug width is exactly 20mm and that the strap is fitted with correctly mounted spring bars.

The lifespan of a leather strap depends on the material and usage. A quality alligator strap can last 5–7 years with routine maintenance; vegetable-tanned calf, if properly cared for, lasts 4–6 years; shell cordovan, due to its fibre density, exceeds 10 years. A rubber strap has a similar lifespan to calf. The most common failure point is at the buckle or where the strap meets the lug. Casati Milano straps include an 18-month warranty against manufacturing defects.