Strap for Divers Sixty-Five 42 Formosa Violin

The lug width (misura ansa) of the Oris Divers 65 01 733 7720 4388-Set LS is 21 millimetres. This dimension represents the structural width between the two attachment points on the case and must be strictly respected when selecting any aftermarket strap. Measurement is performed by positioning a digital calliper between the two lugs, without forcing, to ensure metrological accuracy.

For the Divers 65 01 733 7720 4388-Set LS, straps in alligator (vegetable-tanned leather, brown or cognac tones) or high-quality calf leather are recommended. Alligator maintains formal coherence with the original diving vocation, whilst calf gracefully receives the patina developed by bronze. Alternatively, NATO straps in nautical fabric (grey, dark blue) guarantee historical fidelity and versatility. For intensive aquatic use, FKM rubber or food-grade silicone represent the pure technical choice, resisting chlorine and marine salts.

Strap replacement requires a spring bar tool (specific instrument with two rounded flat tips). Position the watch with the lug facing upward, introduce the tool tips into the lateral spaces of the spring-pin, exert gentle lateral pressure to compress the spring, and extract the strap end from the seat. Repeat the procedure for the upper lug. Installation of the new strap follows the reverse path: align the flat ends to the spring, insert firmly until it clicks into place. Avoid forcing, which could scratch the bronze case.

Yes, any strap in 21mm width is compatible with the Oris Divers 65 01 733 7720 4388-Set LS, provided the ends conform to the universal spring bar attachment standard. Compatibility is guaranteed by the case's constructive specifications, regardless of strap brand. However, to preserve aesthetic coherence and the historical value of the model, it is advisable to select materials and colourings that harmonise with the bronze's natural patina and the reference's diving vocation.

A natural leather strap of artisanal quality (vegetable-tanned leather, alligator, calf) develops a useful life of 3-5 years if subjected to moderate use and regular maintenance care (cleaning with damp cloth, rapid drying, avoidance of prolonged humidity). Degradation accelerates with repeated immersion in fresh or salt water and with intensive perspiration. Leather ages naturally, developing patina and tonal change, a phenomenon aesthetically desirable from a horological perspective. Rotation between multiple straps extends overall longevity, permitting complete drying between uses.