Strap for 29er Chronograph White / Strap

The lug width (also called strap width or ansa) of the M1-25-41-LB is precisely 20 mm. This measurement refers to the functional distance between the two pins/lugs to which the strap attaches. Accurate measurement is essential for compatibility: do not confuse this with the total case width or overall strap width.

For a chronograph of this construction quality, we recommend alligator leather in dark brown or slate grey, which complements the satin-finished case perfectly. For those seeking a naturally developing patina, vegetable-tanned calf offers predictable ageing characteristics. Shell Cordovan represents the pinnacle of tactile refinement. For sport wear, a cotton NATO or technical rubber maintain functionality without compromising the watchmaking heritage.

Use a spring bar removal tool to gently extract the pins securing the current strap. Align the new strap's holes with the lugs, then reinsert the spring bars until you feel a positive click. Ensure the strap is symmetrical and that the closure (deployant clasp or buckle) is oriented correctly downward.

Yes, provided the lug width is exactly 20 mm. Bespoke aftermarket straps, such as those from Casati Milano and available through MilanoStraps, are specifically engineered for this measurement and offer superior construction quality and materials compared to generic OEM alternatives. Always verify compatibility specifications before purchase.

Durability depends on material composition and usage patterns. Vegetable-tanned calf subjected to daily wear maintains structural integrity for 3-4 years; alligator, thanks to its density, readily reaches 5-6 years. Shell Cordovan, more sensitive to humidity, requires greater maintenance but can last 4-5 years. High-grade technical rubber offers extended service life if protected from prolonged UV exposure.