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

The lug width is 24mm. This dimension is critical for selecting a compatible strap: the width must match exactly the distance between the case lugs (attachment points), also called spring bar holes. On a watch of the Aquis's standing, 24mm is the original configuration and ensures optimal proportions between case and strap.

For a diver of this calibre, the ideal strap depends on usage patterns. In frequent diving scenarios, vulcanised rubber is unsurpassed: it does not absorb water, dries quickly, and resists UV degradation. For daily elegant wear, vegetable-tanned leather develops character and patina over time. NATO straps in Cordura textile offer versatility and rapid on-wrist changes. Milano Straps stocks options across all these categories, engineered specifically for the 24mm lug width.

The Aquis employs spring bars (spring-loaded pins) for strap attachment. Equip yourself with a spring bar tool—an inexpensive instrument widely available online—and position it beneath the spring bar in the opposite direction to your intended extraction. Gentle downward pressure will disengage the spring, releasing the strap from its lug. Repeat on the opposite side. Installation of the new strap follows the inverse procedure: the spring bars must seat firmly into the throughholes of the replacement strap.

Yes, provided the strap is constructed for 24mm lug width. Artisanal straps from Milano Straps are regularly compatible with the Aquis and with all watches employing standard spring bars. The quality of premium aftermarket straps frequently exceeds that of the original issue strap: you may select superior materials, bespoke finishing, and—crucially—straps that age with visible character.

A vegetable-tanned leather strap of artisanal construction typically lasts 3–5 years under daily intensive use, extending to 7–10 years if the watch is worn occasionally. Longevity depends on ambient humidity, strap care regimen (periodic cleaning, conditioning with natural wax), and intensity of water contact. An Aquis that regularly immerses in salt water should alternate between leather and rubber straps: this extends overall equipment lifespan and protects leather from accelerated degradation.