Strap for El Primero Chronomaster 38 Stainless Steel / Rose Gold / Silver / Alligator

The lug width of the Zenith El Primero 51.2150.400/69.C713 is 19 millimetres. This measurement represents the internal distance between the two spring bars and must be measured precisely to ensure complete strap compatibility. It is a non-standard dimension in the chronograph landscape, chosen by Zenith to emphasise the vertical proportions of the 38mm case.

For this bicolour version in rose gold and steel, alligator represents the canonical aesthetic choice: its characteristic grain naturally dialogues with the polished surfaces of the case. A vegetable-tanned leather in dark brown or cognac enhances the bicolour, creating chromatic hierarchy. For those preferring versatility, Italian vegetable-tanned calf offers discrete elegance, whilst shell cordovan represents the premium alternative for patina that develops over time.

To change the strap, you must remove the spring bars using a dedicated spring bar tool. Position the tool's tip in the access hole on the inner side of the lug, push downward until the spring bar retracts, then extract the old strap. Reverse the procedure to install the new 19mm strap, ensuring the spring bar clicks correctly into position.

Yes, provided the strap is specifically designed for 19mm lug width. High-quality aftermarket straps (vegetable-tanned leather, alligator, shell cordovan) are completely compatible and often offer greater personalisation than standard Zenith options. Always verify that the spring bars are of correct width and robustness to avoid mechanical play.

A high-quality leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts 3-5 years of daily use with ordinary maintenance. Longevity depends on factors such as sun exposure, humidity, frequency of use and personal care. A Casati Milano strap with an 18-month warranty provides protection against construction defects; after this period, replacement occurs due to natural leather wear, not manufacturing fault.