Strap for Speedmaster Date 40 Stainless Steel / Yellow Gold / Silver / Bracelet

The lug width of reference 323.21.40.40.02.001 is 19mm. This measurement is taken between the outer lugs of the case. It is essential to measure correctly to choose a compatible strap, as 19mm is not a universal standard and straps of other dimensions will not fit properly.

For the two-tone yellow gold and stainless steel 40mm model, we recommend polished black or brown alligator to enhance the gold tone, or burgundy shell cordovan for color depth. If you seek sportiness, a grey-blue NATO or performance fabric underscore the chronograph character. All our 19mm straps on milanostraps.it are compatible with this model.

Using a spring bar tool (included with Casati straps), gently insert the flat tip under the lug and press toward the center of the case to release it. The internal spring retracts, freeing the pin. Remove the old strap and insert the new one by aligning the pins with the lugs, then press until you hear the click. Request a visual guide via WhatsApp from the Casati team if it is your first time.

Yes, any artisanal strap with 19mm lug width is compatible. On milanostraps.it you will find a collection dedicated to 19mm straps ready for immediate change, or you can order a custom creation through Casati Milano with personal choice of leather, thickness, thread color, and buckle type (standard, deployant, or screw buckle).

A noble leather strap (alligator, shell cordovan, vegetable-tanned calf) maintains structure and appearance for 3-5 years of regular daily use, developing authentic patina. Shell cordovan is the most resistant to wear. All Casati Milano straps include 18-month warranty and can be revised, reconditioned, or replaced with loyalty discounts for valued customers.