Strap for Aquis Date Calibre 400 43.5 Stainless Steel / Upcycle

The Oris Aquis 01 400 7790 4150-07 8 23 02PEB features a lug width of 23mm. This non-standard measurement represents Oris's deliberate choice to maintain precise architectural proportions on the wrist. To verify compatibility, measure the perpendicular distance between the internal shoulders of the case using a digital calliper.

The choice depends on intended use: for daily elegance, dark brown alligator or vegetable-tanned calf amplifies the brushed case finish. For frequent diving, FKM rubber or natural caoutchouc maintains elasticity in saltwater. For a radical aesthetic, grey smoke NATO nylon creates visual contrast that lightens the 43.5mm diameter.

Remove the watch from your wrist. Using a spring bar removal tool, gently push the bar inward from the underside of the lug, creating clearance to extract the old strap. Insert the new 23mm strap, aligning the hole with the spring bar, and release. The bar will click into the fixed position. Verify strap stability before wearing.

Yes, aftermarket 23mm straps are fully compatible. Ensure the strap is specifically sized for 23mm lugs, not 20mm or 24mm. Leather, NATO, and rubber straps from specialist artisanal suppliers guarantee robust construction and finishes that respect the integrity of the Oris calibre 400 movement and brushed stainless steel case.

A quality artisanal leather strap (alligator or vegetable-tanned calf) typically lasts 3–5 years with daily wear, varying according to diving frequency and sun exposure. Saltwater accelerates aging; if you use this Aquis frequently at sea, consider alternating with FKM rubber. The patina developing on natural leather over time is an aesthetic asset, not a defect.