Zenith
Chronomaster Original 03.3401.3610/21.M3200— lug 20mm

The lug width of the Zenith Chronomaster Original 03.3401.3610/21.M3200 is 20 mm. This measurement is determined by the distance between the lugs protruding from the sides of the case and represents the correct width for strap installation. Every compatible strap must be made specifically for this dimension to ensure a perfect fit without excessive play or mechanical pressure that could damage the case lugs.

The best strap for the Chronomaster Original depends on your aesthetic preferences and intended use. Alligator or crocodile leather in brown or cognac tones offer maximum formal elegance and pair beautifully with the tricolor dial. Black or dark brown calf leather is more versatile and softens naturally over time. For a contemporary sporty approach, a cotton NATO strap creates an appealing contrast. We recommend choosing a premium material with a double-safety deployant clasp to ensure daily practicality and durability.

To change the strap on the Chronomaster Original, you need to use a spring bar tool to remove the case lugs. Position the flat lever of the tool under the spring bar, apply gentle downward pressure to disengage it, then remove the old strap. To install the new strap, align the strap holes with the case lugs, insert the spring bar, and verify it is firmly secured. If you lack experience, it is advisable to consult a watchmaker or the Casati Milano atelier to avoid damage to the case.

Any quality strap made specifically for 20 mm lug width is compatible with the Chronomaster Original. On milanostraps.it you will find a wide selection of artisanal straps in alligator, calf, NATO, and other materials, all available in the correct size. The Casati Milano atelier also creates custom bespoke straps, allowing you to personally choose the leather, color, clasp, and stitching details, with an 18-month warranty and WhatsApp consultation.

The lifespan of a leather strap depends on the quality of the material, intensity of use, and climate conditions. A strap made from premium leather such as alligator or high-quality calf, used with reasonable care—avoiding excessive moisture and prolonged sun exposure—has an average lifespan of 5–8 years before requiring replacement. Natural leather develops patina and character over time: surface creasing and slight color fading are natural and desirable. The Casati Milano atelier guarantees its straps for 18 months and recommends periodic maintenance with specialized products to preserve the leather's softness and durability.