Strap for Aquis Date 39.5 Stainless Steel / Blue / Bracelet

The lug width is 21mm. This measurement is standardised within the reference number itself and guarantees compatibility with all straps designed for this width. Correct measurement is taken internally from one lug to the opposite lug, perpendicular to the watch case plane.

Vegetable-tanned calf leather offers informal elegance with gradual colour evolution; high-gloss black alligator emphasises contemporary instrumental character; NATO in cordura fabric provides sporting practicality; black FKM (Viton) rubber maintains absolute aquatic functionality. Choice depends on intended use and desired aesthetic dialogue with the ceramic bezel.

Strap replacement occurs via the lug holes present on both sides of the case (3 o'clock and 9 o'clock positions). Using a spring bar tool, gently press the retaining spring and extract the bar. Install the new strap on the same bar and secure it on the lugs, verifying that the spring engages correctly. This operation takes minutes and can be performed at home.

Absolutely. Any strap with standard 21mm lugs installs perfectly on the case lug holes. The sole critical parameter is the spring bar gauge, which must be 1.8mm or 2.0mm according to Oris standards. Quality artisanal straps include the correct springs or specify compatibility details.

Lifespan depends on material and usage patterns. Vegetable-tanned calf, exposed to temperate climates and without frequent immersion, lasts 3-5 years before replacement. Alligator, owing to more robust scale structure, can reach 5-7 years. If the watch is frequently submerged, rubber or purpose-designed synthetic straps are recommended. Natural patina evolves with time, but mechanical wear accelerates in saline or high-humidity environments.