Strap for BelleArti 24.6 Modern Diamond

The Longines Heritage L2.504.0.87.2 features a 15mm lug width, a specific dimension that distinguishes it from common standards such as 16mm, 18mm, or 20mm. This measurement is critical for compatibility: the strap must have internal lugs calibrated precisely to 15mm for a proper fit between the case pins.

To enhance the vintage-modern character of this 24.6mm timepiece, an alligator strap in natural tone (ochre, light brown) amplifies the Art Deco aesthetic. A luxury alternative is shell cordovan, whose luminous patina ages magnificously. For daily wear, vegetable-tanned calf or a cotton NATO offer versatility and durability without aesthetic compromise.

The strap is removed by extracting the metal pins connecting the lugs to the case using a spring bar remover tool. The procedure is delicate: position the watch on a protected surface, gently compress the pin with the tool, remove the old strap and insert the new one by aligning the lugs to the case holes. If inexperienced, a professional watchmaker will complete the operation in minutes.

Yes. Quality aftermarket straps with 15mm lug width are fully compatible. At Milano Straps you will find a collection of artisanal straps in various leathers (alligator, calf, shell cordovan) customisable in sizes, colours and stitching. The Casati Milano atelier also offers bespoke solutions on commission with 18-month warranty.

The lifespan of a leather strap depends on material, use and maintenance. Quality alligator or shell cordovan lasts 3–5 years of daily wear; vegetable-tanned calf 2–3 years. Natural ageing is part of the charm: patina tells the strap's story. Protecting leather from excessive sweat and moisture extends its life; occasionally applying a dedicated watch leather balm preserves flexibility and colour.