Strap for Chronoris Limited Edition / Rubber

The lug width of the Chronoris 01 673 7739 4034-Set RS is precisely 20mm. This dimension was selected to maintain visual balance with the 40mm case diameter. To verify correct measurement, use a digital calliper positioned between the inner lug shoulders: the distance should read 20.00mm ±0.5mm.

Four primary strap materials are recommended for this Swiss chronograph: vegetable-tanned alligator for formal occasions (Hornback grain creates striking contrast with the brushed case), vegetable-tanned calf for those seeking evolving patina over time, NATO canvas for practicality and versatility (instant swap without tools), vulcanised rubber for humid environments and aquatic sports. Selection depends on usage context and personal aesthetic preference.

Strap replacement requires a spring bar tool—a small bevelled steel lever—to compress the spring-loaded pins securing the strap to the lugs. Position the flat end of the tool into the pin groove, apply controlled pressure to flex the spring, extract the old strap and insert the new one by aligning the lug holes. This operation requires no specialised labour if executed with care.

Yes, the Chronoris is fully compatible with quality aftermarket straps provided they feature 20mm lugs. Numerous artisanal manufacturers create custom straps specifically sized for this measurement, offering extensive choice of materials (alligator, shell cordovan, calf, exotic leathers) and colourways unavailable in OEM markets.

A well-crafted vegetable-tanned leather strap with 20mm lugs has an average lifespan of 18–36 months under daily wear and moderate moisture exposure. Vegetable-tanned alligator tends to last slightly longer (24–48 months) owing to the fibre structure of the skin. Durability depends on exposure to perspiration, rain and thermal variations: a strap rotated among two or three watches has a considerably longer service life.