Strap for Aquis Date Calibre 400 43.5 Stainless Steel / Green / Bracelet

The lug width is 23mm. This measurement is determined by the distance between the internal attachment points of the strap on the case. To measure accurately, position a ruler perpendicular to the case between the lugs: the value must coincide with 23mm to guarantee precise compatibility and coherent aesthetics.

The ideal strap depends on usage. For formal elegance: alligator or vegetable-tanned calf leather. For authentic marine purpose: cold-vulcanised nitrile rubber with anti-slip texture. For everyday versatility: polyamide NATO. All are compatible with the 23mm lug width and maintain the visual proportions of the 43.5mm case.

The strap is changed using a dedicated tool (spring bar tool) or by consulting a watchmaker. Insert the tool tip into the slot beneath the lug, push laterally to release the internal spring, extract the bar (spring bar). Repeat on the opposite side. Install the new strap by reversing the procedure. This is a straightforward operation requiring care to avoid scratching the case.

Yes. The Aquis 01 400 7790 4157-07 8 23 02PEB accepts any quality strap with 23mm attachment (standard spring bar). Milano Straps offers leather (alligator, calf, shell cordovan), military NATO and professional rubber, all tested for precise tolerances and immediate comfort. Compatibility is guaranteed; aesthetic result depends on colour choice and material.

Durability depends on material, tanning and frequency of use. A premium alligator or vegetable-tanned calf, worn regularly (not daily), resists 3–5 years whilst maintaining structural integrity. Sweat exposure accelerates wear; prolonged humidity can encourage mould if the strap is untreated. Professional rubber, conversely, resists 7–10 years with minimal maintenance. Patina on natural leather represents aesthetic ageing, not functional deterioration.