Strap for Diver Automatic Black / Rubber

The lug width of the Formex Diver 2100.1.7020.910 is 22mm. This measurement is taken internally between the two attachment points of the spring bar on the lugs. The 22mm specification ensures proportional balance relative to the 46.50mm case diameter and provides access to a broad range of quality artisan straps.

The choice depends on intended use: for actual diving, an FKM or Nitrile rubber strap provides wet grip and compatibility with wetsuits; for daily versatility, a premium NATO in cotton or cotton blend retains the tool-watch character; for formal occasions, quality alligator in natural brown or black imparts gravitas without betraying its technical vocation.

Strap change is a straightforward procedure: locate the spring bar on each lug, use a dedicated strap tool or small flat implement to compress the spring, release the old strap end, insert the new one, and release the spring. The operation requires patience but no specialised skill. We recommend working on a flat surface to avoid losing small components.

Yes, any strap with a 22mm lug width is physically compatible. However, we recommend selecting manufacturers that guarantee build quality: an inferior strap compromises the experience of a technically serious timepiece. Artisan straps in vegetable-tanned leather or technical rubber represent a significant upgrade over mass-produced alternatives.

A quality leather strap, with vegetable tanning and solid construction, typically lasts 3-5 years under daily wear, depending on climate, frequency of use, and maintenance. Constant water exposure accelerates ageing; the strap develops natural patina and may require replacement when stitching begins to fail or leather loses elasticity. Rubber offers superior longevity in extreme environments but is less aesthetically regenerable.