Longines
Record L2.821.4.56.6— lug 20mm

The lug width (ansa width) of the Longines Record L2.821.4.56.6 is exactly 20 millimetres. This intermediate standard ensures compatibility with both artisanal and industrial watch straps, requiring precision during installation to avoid undesirable lateral gaps or excessive tension when inserting the spring bars.

The best strap depends on intended use: a vegetable-tanned alligator in bordeaux or cognac brown delivers formal elegance with a patina that evolves over time; black calf leather guarantees daily versatility and straightforward maintenance; a sand-coloured nato fabric offers summer lightness. We recommend avoiding rigid varnished leather straps that would burden the Record's classic profile.

Remove the old strap using a spring bar tool, pressing the horizontal pins inward to release the lugs from the case. Insert the new strap by aligning the first lug first, then the second, ensuring both pins click securely into place. Verify the absence of lateral gaps and uniform tension across the lugs.

All straps with a 20mm lug width are compatible, whether in leather (calf, alligator, shell cordovan), fabric (nato, canvas), or vulcanised rubber. We recommend choosing artisanal producers of high quality to preserve the aesthetic and constructive value of the Swiss timepiece.

A leather strap's lifespan ranges from 3–7 years depending on material and usage patterns. Vegetable-tanned alligator tends to last longer due to fibre density; gummed calf leather resists moisture better but wears faster under daily friction conditions. Regular maintenance (drying after perspiration, annual conditioning) substantially extends strap longevity.