Strap for Diver Automatic Blue / Croco

The lug width of the Formex Diver 2100.1.7030.243 is 22mm. This technical specification is determined by the case geometry and the depth of the lug holes. It is essential to verify compatibility by using a digital calliper to measure the internal distance between the lugs before purchasing an aftermarket strap. An incorrectly sized strap would compromise the watch's ergonomics and wearability.

For the Formex Diver 2100.1.7030.243, we recommend a vegetable-tanned leather strap (Tuscan Supreme) for its extraordinary natural patina development over time, or genuine alligator for lasting elegance exceeding 10 years. For intensive marine use, a heavyweight cotton-polyester NATO or FKM medical-grade rubber delivers optimal performance. Selection depends on the primary use environment: office and formal occasions require leather; saltwater and humid climates demand rubber or NATO.

To change the strap, gently remove the watch from your wrist. Locate the spring bars holding the strap to the case lugs. Using a spring bar tool or the blunt end of a knife, press downward on the spring bar whilst keeping the strap firm. The bar will retract, allowing the strap to slide away. Insert the new 22mm strap, aligning it with the lugs, then slide the spring bar back into its original position. Verify that the strap is securely fastened on both sides before wearing the watch.

Yes, the Formex Diver 2100.1.7030.243 is fully compatible with quality aftermarket straps, provided the lug width is certified as 22mm. The case spring bars are standardised, so any quality strap with this specification will fit perfectly. We recommend selecting robust materials (vegetable-tanned leather, alligator, medical-grade rubber) that respect the technical and sporting nature of the watch.

A superior quality leather strap (vegetable-tanned or alligator) on a Formex Diver 2100.1.7030.243 typically lasts 4–6 years with daily wear, extending to 8–10 years with occasional use. Longevity depends on environmental humidity, direct sunlight exposure, and frequency of water contact. A rubber or NATO strap requires replacement more frequently (2–3 years) but at lower cost. Vegetable-tanned leather develops a prized patina over time, improving aesthetically with natural ageing.