Strap for Orion 35 Anthracite / Open Case Back

The Nomos Glashütte Orion 307 features a lug width of precisely 18 millimetres, measured from the inner edge of one lug to the inner edge of the opposite lug. This dimension is specific to this model and requires straps dimensioned with accuracy. Measurement must be conducted with lugs parallel, not with a bent tape measure, to avoid systematic error.

Alligator in natural colour is the most coherent choice with the formal identity of the 307. The regular grain and tactile consistency maintain visual integrity alongside the stainless steel case. For more constrained budgets, vegetable-tanned calf offers developing patina over time. Shell cordovan represents a sophisticated alternative for those seeking tactile density and conservative lustre.

Strap change requires specialised tools: a spring bar tool to remove the lug springs without damaging the case. Position the watch with the lug facing the operator, insert the spring bar tool into the internal spring slot, apply gentle pressure to extract it, remove the used strap. Reverse the procedure with the new strap, ensuring the spring is properly seated in both holes. For leather straps, avoid water contact during the operation.

Yes, the Nomos Orion 307 is compatible with any aftermarket strap equipped with 18-millimetre lugs. The market offers artisanal options in alligator, calf, shell cordovan, NATO and rubber. The 18mm specification is less common than standard 20mm, but guarantees optimal aesthetic results when the pairing is correct, preserving the original proportions of the 35-millimetre case.

A quality leather strap (alligator, calf, shell cordovan) typically lasts between 3 and 5 years with daily wear. Longevity depends on factors such as wearing frequency, climatic conditions, relative humidity and maintenance. Vegetable-tanned leather, whilst less resistant to moisture than chrome-tanned leather, develops precious patina and may last twice as long if preserved in controlled conditions. The strap should not be exposed to prolonged direct sunlight or relative humidity exceeding 65%: the material tends to dry out or ferment.