Strap for Master Collection 40 Chronograph Calendar Stainless Steel / Anthracite / Bracelet

The lug width of this model is 21mm. This is the distance between the two lugs where the strap attaches to the case. Accurate measurement is essential to ensure perfect compatibility with aftermarket straps.

The choice depends on intended use and personal preference. Dark alligator is the most refined option, perfectly aligned with the watch's classical aesthetic. Vegetable-tanned calf offers dynamic appeal through evolving patina. Shell cordovan ensures durability and a subtle sheen ideal for formal contexts.

The strap is changed by removing the two spring bars from the lugs. Use a dedicated spring bar tool to apply controlled pressure on the springs and release them inward. Extract the current strap and insert the new one, securing the springs within the case's lug supports. Work with care to avoid scratching the steel.

Absolutely. A quality aftermarket strap sized for 21mm lugs is fully compatible. Verify the lug width is correct (21mm between supports) and ensure the buckle or deployant clasp material and finish harmonise with the case steel to maintain aesthetic coherence.

A high-quality leather strap (alligator, calf, shell cordovan) typically lasts 3–5 years of daily wear before replacement becomes necessary. Longevity depends on usage frequency, sun exposure, humidity levels, and regular care. Vegetable-tanned leather develops patina but maintains function longer than lower-grade chromium-tanned alternatives.