Strap for El Primero Chronomaster 42 Stainless Steel / Silver / Rubber

The lug width of this model is 21 millimetres. This measurement represents the internal distance between the case lugs and is critical for purchasing compatible straps. To measure it correctly, use a digital calliper positioned perpendicularly between the lugs, ensuring the value corresponds exactly to 21mm before ordering any strap replacement.

Alligator leather represents the most versatile choice: it offers elegant and regular texture, wrist comfort, and the ability to adapt to both formal and casual contexts. Shell cordovan is excellent if you desire a compact leather with natural patina and intense burgundy colour. Vegetable-tanned calf leather guarantees chromatic evolution over time, acquiring character and depth. For a pure sports interpretation, rubber or Cordura straps maintain functionality and comfort while enhancing the chronograph nature of the watch.

The replacement requires removal of the case lugs using a dedicated tool (spring bar tool). Position the watch on a stable, soft surface. Insert the spring bar tool into the small lateral hole of the lug, gently expand the internal spring and extract the lug from the case. Repeat for the other side. Insert the new strap by positioning the lug in the upper passant, expand the spring and position the lug in the lower passant. Verify that the strap is securely attached and centred with respect to the case.

All straps with a 21-millimetre lug width are compatible with this model. At milanostraps.it you will find a collection dedicated to 21mm straps, crafted in fine leather (alligator, shell cordovan, calf) with artisanal finishes, reinforced passants and available in sizes from S to XL. Each strap can be personalised with initials, stitching thread colour and final length, guaranteeing a perfect fit to your wrist.

A quality leather strap, properly maintained, lasts an average of 3-5 years with daily use. Lifespan depends on frequency of use, exposure to moisture and heat, and maintenance operations. Artisanal straps made with fine leathers (alligator, shell cordovan) tend to last longer thanks to the density and compactness of the material. Vegetable tanning develops natural protective patina over time. Protecting the strap from excessive moisture and perspiration, and having it inspected annually, significantly extends its useful life.