Strap for Oris Big Crown 01 645 7629 4061

The lug width (ansa width) of the Big Crown 01 645 7629 4061 is 22 millimetres. This measurement represents the distance between the two lugs — the metal pins that secure the strap to the case. It is essential to verify this dimension before purchasing a new strap, as even a minor error would render the accessory incompatible with the watch.

There is no universal choice; it depends on the intended use. For elegant contexts, dark brown alligator or vegetable-tanned calf leather is recommended. For an authentic aviator aesthetic, a recycled NATO strap — such as the Military Green offered by Milano Straps — enhances the watch's historical heritage. For technical or aquatic use, FKM rubber ensures maximum durability.

Strap replacement requires a specific tool called a spring bar tool. Insert the flat tip of the tool into the small lateral hole of the lug, lift slightly to release the metal spring bar, then remove the old strap. Insert the new spring bar into the new strap and lower it into the opposite holes until you hear a click. If unsure, consult a professional watchmaker.

Yes, provided the strap is 22mm lug width and the construction quality ensures stability. Milano Straps manufactures Italian artisanal straps compatible with this measurement: each product is tested for strength and reliability. Always verify that the spring bars are of appropriate quality to prevent sudden failure.

Longevity depends on the material and environmental conditions. An alligator or shell cordovan strap, well-maintained, lasts 3-5 years of daily use. Vegetable-tanned calf requires regular care — drying after humidity exposure, protection from direct UV rays — to preserve the patina and slow wear. Milano Straps provides maintenance guidelines for each strap type.