Strap for Aquis Date 39.5 Stainless Steel / Blue / Calf

The lug width is 21mm. This measurement is the internal distance between the two lugs on the case, where the strap is inserted. On the 01 733 7732 4135-07 5 21 10FC, the lugs are integrated into the case (not removable), so the strap must conform to the natural curve of the case-to-lug transition without adding excessive thickness at the attachment points.

Choice depends on use. For frequent diving: vulcanised elastomer rubber (salt-resistant, quick-drying, vibration-absorbing). For elegant-functional pairing: African alligator with vegetable tanning (natural texture, inherent grip, evolving patina). For high-impact working environments: woven polyamide NATO strap. Alligator offers the finest balance between underwater performance and formal aesthetic presence, with a patina that deepens over time.

Since the lugs on the 01 733 7732 4135-07 5 21 10FC are integrated into the case (non-removable), you must slide the strap around the lugs following the case curve. Proceed slowly and under control to avoid excessive twisting. If the strap is rigid, soften it slightly with steam (never direct flame). Work from one side at a time: remove from the left side, insert the new strap from the same side. Verify that the new strap has no concentrated thickness near the attachment points, or you will create uneven tension.

Yes, provided they are specifically dimensioned for 21mm lug width. Not all universal 21mm straps fit identically: the curve and thickness near the attachment points must respect the geometry of the Oris's integrated lugs. High-quality artisanal straps (full-grain leather with vegetable tanning, structured rubber) offer superior compatibility versus standard industrial products. We recommend verifying exact dimensions before purchase.

A high-quality alligator or calf leather strap (vegetable-tanned) lasts 18-36 months with daily wear, provided it is not exposed to rapid humidity-dryness cycles. If the Aquis is used frequently in a marine environment, lifespan decreases to 12-18 months because salt accelerates collagen oxidation. Post-immersion maintenance (fresh-water rinse, slow air-drying) significantly extends strap life. By contrast, rubber withstands 36-60 months under identical conditions, though it does not develop aesthetically like leather.