Strap for El Primero Chronomaster 42 Stainless Steel / Anthracite / Alligator

The lug width is 21mm, referring to the vertical distance between the spring bars that connect the strap to the case. This measurement is critical for ensuring full compatibility with any aftermarket strap. Any 21mm strap will fit this model perfectly.

For this chronograph, we recommend alligator for a classic-sport approach, or vegetable-tanned calf leather for those seeking a patina that develops over time. Shell cordovan in cognac tones creates exceptional chromatic synergy with the dial. NATO canvas is practical and versatile for frequent changes. Rubber is ideal if you seek an instrumental, minimalist aesthetic.

Removing the strap is straightforward. Use a spring bar tool to gently lever the pins connecting the strap to the case lugs. Lift carefully until the pin disengages fully. Repeat on the opposite side. Insert the new 21mm strap by aligning the lugs with the case pins and press until you feel the spring bar lock into position.

The choice depends on usage and aesthetic preference. For classic elegance: alligator or shell cordovan. For daily versatility with ageing patina: vegetable-tanned calf leather. For convenience and quick changes: NATO canvas. For maximum sportiness and durability: FKM rubber. All these materials are available in 21mm sizing on milanostraps.it and customizable in length and stitching thread colour.

A quality leather strap, crafted with vegetable tanning or alligator, typically lasts between 3 to 5 years with moderate daily use. Longevity depends on humidity exposure, UV rays and usage frequency. Alligator tends to be more resilient than standard calf. Casati Milano offers an 18-month warranty on bespoke straps, with reinforcement options available for those anticipating intensive use.