Strap for Divers Sixty-Five 40 Social Club Edition / Singapore

The lug width of this model is precisely 20mm. This is a specific dimension machined directly into the stainless steel case block, not a consolidated industrial standard. To verify it correctly, measure the internal space between the two lugs from the bottom plane of the left lug to the bottom plane of the right lug. A strap that enters with difficulty does not meet Oris tolerances.

It depends on intended use and aesthetic preference. An alligator strap with vegetable tanning creates sophisticated contrast; shell cordovan is more moisture-resistant with natural ageing patina; a NATO in Cordura canvas maintains period authenticity; an FKM (Viton) rubber strap is 100% waterproof and ideal for actual diving use. We recommend assessing your usage context before selecting.

The strap is changed by removing the connecting pin—a small rod that passes transversely through the lugs. Use a dedicated tool (spring bar removal tool) or a thin blade, gently pushing the pin downward to release the internal spring. Insert the new pin into the new strap, then position it in the case lugs ensuring both sides of the pin are firmly seated. Never force: if the strap does not enter smoothly, verify that the lug width is indeed 20mm.

Yes, provided the aftermarket strap respects the exact 20mm tolerance. However, since 20mm is not a consolidated standard in the watch industry, most commercial straps do not adhere to this specification. We recommend an artisanal custom strap where the maker can verify micrometric tolerances and adapt the strap to your specific case lugs.

A natural leather strap subjected to regular saltwater contact has a lifespan of 12-18 months before showing structural degradation signs (excessive softening, permanent fibre deformation). In dry-use contexts (desk, urban), longevity extends to 3-4 years. For frequent underwater use, we recommend an FKM rubber strap or synthetic NATO. If you wish to maintain leather, plan rotation of at least two straps, alternating them after each dive to allow natural drying.