Strap for Speedmaster Racing Co-Axial Chronograph Stainless Steel / Silver-Yellow / Bracelet

The lug width is 20mm. This measurement should be verified by calculating the distance between the inner edges of the two lugs on the case. The 326.30.40.50.04.001 uses standard 20mm attachments, compatible with a wide range of quality aftermarket straps.

For this chronograph we recommend natural alligator for a formal and refined look, or vegetable-tanned calf for those seeking warmth and patina over time. FKM rubber is ideal for sporting contexts, while shell cordovan represents the premium choice for longevity and aesthetic uniqueness.

Straps on 20mm lugs are changed using a spring bar tool, inserting the lever into the small lateral opening of the lug and gently compressing the spring. We recommend working on a clean, well-lit surface. For Milano Straps customers, custom mounting service is available at the atelier.

An aftermarket strap is pre-made in standard sizes and delivered quickly. A bespoke strap is sewn to measure at the Casati Milano atelier, with personal leather selection, length precise to the millimeter, personalized stitching thread and 18-month warranty. The bespoke experience includes WhatsApp updates and direct contact with the craftsman.

A well-maintained alligator or vegetable-tanned calf strap lasts 5-8 years in daily use. Shell cordovan, thanks to its density, can exceed 10 years. Durability depends on exposure to moisture, heat and maintenance. Milano Straps guarantees 18 months on all bespoke straps, covering the critical initial use phase.