Strap for Record 30mm Stainless Steel / Pink Gold / Black-Diamond / Bracelet

The lug width of the Longines Record L2.321.5.57.7 is 20mm. This measurement represents the internal distance between the case lugs. To verify compatibility, position a digital calliper between the two vertical attachment points on the case, excluding the lug pin diameter itself. With the reference L23215577 (alternative designation of the model), the measurement must consistently return 20mm.

For this 30mm bi-colour model (stainless steel and rose gold), an alligator strap in black represents the supreme formal choice, emphasizing the case elegance without visual competition. If you prefer a warmer tone, dark brown alligator (cognac) amplifies the rose gold richness. For summer versatility, a navy blue NATO maintains sobriety. Vegetally tanned alligator offers patina that evolves over time, adding aesthetic value to the strap.

Strap replacement requires a spring bar remover tool (small dual-tipped screwdriver) or dedicated extractor. Position the watch face-down on a soft surface. Insert the flat tip of the tool under the spring bar from one side, applying gentle outward pressure until the pin compresses. Remove the old strap and insert the new one by aligning the holes. Repeat on the other side. Verify that the spring bar is perfectly seated to prevent accidental loss.

An OEM Longines strap maintains original construction specifications: width, thickness, buckle type (deployante if present) and finishes. A quality aftermarket strap, manufactured to 20mm lug width specifications, offers colour solutions and materials unavailable in the Longines catalogue, such as certified alligator, artisanal vegetable tanning or natural rubber. Mechanical compatibility is guaranteed by correct lug width measurement; the difference lies in construction quality and artisanal finishing.

Durability depends on material and usage. An alligator or shell cordovan strap, with ordinary care (drying after water exposure, protection from direct heat), maintains structural integrity between 3 and 5 years of daily wear. Vegetable-tanned leather visibly evolves during the first year, developing patina and tonal variations, without losing functionality. A NATO fabric strap lasts over 5 years. The buckle represents the critical point: deployante mechanism wear may require replacement even if leather remains intact. Casati Milano offers 18-month warranty on all custom-made artisanal straps.