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

The lug width is precisely 19mm. This is a specific measurement for this generation of El Primero and is not interchangeable with other references. To verify, remove the strap and measure the internal spring bar: it must be exactly 19mm for perfect fitment without play or mechanical friction.

We recommend Porosus alligator in vegetable tanning for practicality and durability, or shell cordovan for those seeking an aesthetic evolution parallel to the ageing of the blue patina. For daily summer use, high-quality calf offers a good compromise. Grey or black rubber is ideal for humid environments and water sports.

Use a small spring bar removal tool positioned in the slot of the spring bar. Push gently inward to release one end, then extract the bar. Repeat on the opposite side. Insert the new strap by threading the lugs through the slots and securing the spring bars with a firm click.

Yes, 19mm straps are universally compatible with any watch featuring 19mm lugs. However, the visual proportion of a strap is always calculated in relation to the case diameter: for your 38mm El Primero, we recommend maintaining 19mm width to avoid altering aesthetic balance.

A high-quality alligator or shell cordovan strap lasts between 5 and 7 years of daily use with periodic maintenance (cleaning and conditioning). Quality calf lasts approximately 4-5 years. Longevity depends on wrist humidity, sun exposure, and usage frequency. Casati Milano atelier offers an 18-month warranty on handcrafted straps.