Strap for Orion 35 / Closed Case Back

The Orion 301 features 18-millimetre lugs, the standard dimension for medium-format timepieces. This measurement is consistent across all Orion 301 references and corresponds to the width of compatible watch straps.

The ideal strap depends on your intended use. For formal elegance, alligator leather with vegetable tanning or shell cordovan develop natural patina. For robust daily wear, calf leather with a stainless steel deployant clasp offers both comfort and durability. NATO straps emphasise the contemporary Bauhaus aesthetic. Natural rubber straps provide humidity resistance and excellent grip.

Use a spring bar tool to carefully remove the lugs from the previous strap without forcing the case. The Orion 301's lugs measure 18 millimetres in width: insert the new strap through the lug from below, aligning the strap's pass-through with the lug hole, and press firmly until the retaining clip engages. Avoid applying pressure to the case during this operation.

Yes, any strap with an 18-millimetre lug width is compatible. However, verify that the strap's pass-through allows smooth insertion into the case lug: overly narrow pass-throughs would force the retaining clip. For optimal compatibility, select straps from specialised suppliers who certify strap dimensions.

A quality leather strap, with vegetable tanning, typically lasts 3–5 years under normal daily use conditions. Longevity depends on exposure to sunlight, humidity, and cleaning frequency. Shell cordovan and alligator leather with vegetable tanning age more gracefully and can last 5–7 years. Wear on the pass-through is the first indicator of replacement necessity.