Strap for Mission Timer UX S EZM 2B

The lug width of the Sinn 403.060 measures 22 millimetres. This dimension, measured internally between the lugs, determines mechanical compatibility with any strap material: leather, NATO, rubber, or specialist technical straps. On a 44mm dive watch case diameter, 22mm represents the ideal proportional relationship.

The choice depends on usage context. For professional diving and marine environments, a NATO strap in ballistic nylon or cordura is the maximalist solution: waterproof, durable, and replaceable underwater. For mixed use (formal plus operational), a vegetable-tanned leather strap offers restrained elegance and natural ageing. A vulcanised rubber strap is the austere, maintenance-free choice, ideal for those integrating the 403.060 into professional technical equipment.

The procedure is standard for any watch with pin-and-spring bar lugs. Using a dedicated spring bar tool, insert the lever into the lateral grooves of the pins supporting the lug, apply gentle pressure to release the internal spring, and extract the pin completely. Repeat on the other side. Position the new 22mm strap, reinsert the pins with reverse motion, and verify that both sides click correctly into the respective watch case lugs. Avoid forcing: a correctly positioned pin enters with moderate pressure.

Yes, provided the strap is specifically designated for 22mm lugs. Mechanical compatibility is guaranteed: standard pins will seat into the lugs without forcing. The only variable is the strap's thickness: some thick leather models may create minimal under-lug compression, visible to those examining the watch disassembled. NATO and rubber straps present no such issue. Milano Straps supplies only straps verified for compatibility.

A vegetable-tanned leather strap, worn daily on a dive watch used occasionally in water, has a service life of 3–5 years before internal structure begins to fail. If exposed frequently to salt water (chlorine and salt), durability reduces to 2–3 years. Surface patina develops within the first months. To extend strap life, dry thoroughly after prolonged saltwater exposure and lubricate articulations with neutral oil every six months. A rubber or NATO strap lasts indefinitely with only visual maintenance.