Strap for Rectangular Day Date 30 Stainless Steel / Silver

The lug width of the Oris Rectangular 01 585 7525 4061-07 5 20 42FC is 20mm. This measurement is taken from the external point of one lug to the external point of the opposite lug, directly between the spring bar fixings. This is the historical standard for vintage rectangular watch cases and is essential to maintain for perfect fit without mechanical play.

Your choice depends on intended use. For maximum elegance, we recommend French or South African alligator with fine grain. For a visibly aging patina, vegetable-tanned calf leather is ideal. If you seek versatility, NATO straps in canvas and nylon allow rapid switches between contexts. Natural vulcanised rubber is the contemporary solution for high-humidity environments.

The Rectangular 01 585 7525 4061-07 5 20 42FC features welded lugs. Strap change requires a dedicated extraction tool (spring bar tool or nail pin tool). Insert the tool into the spring bar groove, apply gentle pressure and rotate the spring bar until it yields. Remove the old strap and fit the new one by aligning its holes with the watch lugs, then reinsert the spring bar.

Yes, absolutely. Any aftermarket 20mm strap is compatible with the Rectangular 01 585 7525 4061-07 5 20 42FC. You must verify that the width is precisely 20mm and that the spring bar holes correspond to the lug positioning of the watch case. We offer straps in alligator, calf leather, NATO and rubber, all calibrated for this lug width.

Durability depends on material and usage patterns. Quality alligator lasts 8–12 years with moderate daily wear. Vegetable-tanned calf resists 6–10 years but changes colour and patina visibly. Natural rubber resists 5–7 years before hardening. Factors such as perspiration, sun exposure and maintenance significantly influence lifespan. Annual waterproofing and regular soft-cloth cleaning extend service life considerably.