Strap for Diver Quartz GMT Black / Rubber

The lug width of the Formex Diver 2100.3.2022.910 is 22 millimetres. This measurement represents the distance between the inner shoulders of the two case lugs. To verify aftermarket strap compatibility, measure precisely using a digital calliper positioned perpendicularly between the lugs: the value must be 22.0 mm, with a tolerance of ±0.3 mm in the case of elastic deployante buckles.

The ideal strap depends on intended use. For professional diving or tactical environments, we recommend NATO in polyamide or FKM rubber: they guarantee performance in extreme wet conditions and allow rapid field replacement. For daily-wear semi-formal combinations, traditional Tuscan vegetable tanning offers evolving colour patina and superior tactile grip. Genuine alligator proposes a middle ground between elegance and functionality. With a titanium and stainless steel case, any material interacts coherently with the diver: the choice remains aesthetic and behavioural.

The strap is replaced via the lug pins (spring bars). Position the watch with the dial facing downward on a soft surface. Use a spring bar tool (small implement with a blunt lever) to gently compress the elastic pin on one side of the lug, creating sufficient space to extract the old strap. Insert the new strap by first sliding one lug into the pin, then gently compress the opposite pin and slide in the second lug. Verify that the strap is securely engaged and that the watch does not move on the lug.

Yes, the Formex Diver 2100.3.2022.910 is fully compatible with quality artisanal 22 mm aftermarket straps. The lug width is standard in the watchmaking industry and easily sourced. We recommend straps crafted with vegetable tanning, oiled calf, genuine alligator, or synthetic materials (NATO, FKM rubber) from specialist suppliers. Always verify that the width corresponds to 22 mm and that the lug pins (spring bars) are compatible with your preferred passant length and thickness.

The lifespan of a leather strap depends on tanning method, frequency of use, and environmental exposure. A high-quality Tuscan vegetable-tanned strap, worn daily in normal conditions (not regular diving), provides 2–4 years of use before the fibre structure begins to yield. With frequent immersion, lifespan reduces to 1–2 years. Alligator and shell cordovan offer greater longevity (4–6 years) due to the biological structure of the leather. A NATO or rubber strap lasts indefinitely from a structural standpoint, although it loses grip and flexibility after 3–5 years of constant contact with moisture and UV.