Strap for El Primero Chronomaster Open Stainless Steel / Blue 1969 / Rubber

The lug width is 21mm. This measurement is specific to the 42mm model and is essential when purchasing an aftermarket strap. To verify, measure the distance between the metal pins inserted in the spring bar slots on your watch case.

It depends on your use case: for formal elegance, we recommend alligator or shell cordovan with hand-stitching; for sporty versatility, vegetable-tanned calf or FKM rubber; for practicality, a Cordura NATO in tight weave. The 42mm diameter comfortably accommodates rich leather straps without appearing oversized.

Zenith straps are secured using spring bars inserted in the lug slots. Insert the spring bar into its side mounting, then slide the strap outward until the spring bar disengages from its seat. Reverse the process to install a new strap. No tools are required if the spring bars are intact.

Yes, provided the lug width is exactly 21mm. Artisan straps from specialised suppliers like milanostraps.it offer guaranteed compatibility, typically featuring superior finishing to Zenith factory replacements and options for leather choice, colour, and stitching customisation.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3–5 years of daily wear, depending on tanning method, sun exposure, and humidity. Vegetable-tanned leather develops a patina that improves aesthetically over time. Artisan straps usually carry an 18-month warranty against manufacturing defects.