Strap for Divers Sixty-Five 40 112H Calibre 400 / Bracelet

This model features a 20-millimetre lug width—an exceptional dimension in contemporary diving watches, honouring the standards established in the 1960s-70s submarine instrument era. To verify strap compatibility, position a digital calliper perpendicular to the watch plane between the two lugs: the measurement must read 20.00 ± 0.2mm. MilanoStraps maintains a specialised collection in 20mm lugs, excluding generic approximations.

The choice depends on intended use. For classical elegance, vegetable-tanned leather in cognac or light brown complements the sunburst dial's depth, developing natural patina over time. For regular diving, alligator leather in black or deep blue offers superior moisture resistance and refined grain texture. NATO straps in grey-blue or black ensure military functionality and rapid exchange with gloved hands. Biological FKM rubber in black represents the most durable choice for humid and chlorinated environments. Consult MilanoStraps' Oris 20mm collection to evaluate texture, thickness, and passant finish.

The procedure requires minimal tools: a spring bar remover and a soft work surface to protect the case. Position the watch with the lug facing upward, insert the remover into the lateral groove of the spring, apply gentle pressure inward to release the rod from the upper lug, then extract the strap. For installation, insert the spring rod into the lower hole of the upper lug, then compress slightly inward until it engages with the lower lug. Avoid excessive force to preserve case finishing. If uncertain, Casati Milano's atelier offers professional strap change on appointment.

Yes, provided the lug width measures exactly 20 millimetres. Many generic '20mm' straps feature inadequate manufacturing tolerances (±0.5mm or greater), causing excessive play or friction on the lugs. MilanoStraps straps are engineered and tested specifically for luxury watches, with certified tolerances of ±0.2mm and verified materials (full-grain leather, alligator, FKM). We recommend verifying technical specifications and contacting Casati Milano atelier for personalised consultation if uncertain.

Durability varies by material and usage patterns. Vegetable-tanned leather, worn daily, maintains structural integrity for 2-3 years; natural patina intensifies aesthetically. Alligator leather, owing to grain compactness, extends longevity to 4-5 years under normal conditions. Exposure to salt water and direct UV accelerates ageing; alternating with NATO or rubber straps during regular diving is advisable. Biological FKM rubber sustains stable elastic properties for 5-7 years in humid environments. MilanoStraps provides restoration and re-stitching services to extend the lifespan of artisanal straps.