Strap for Aquis Chronograph 45.5 Stainless Steel / Blue / Calf

The lug width is 22mm. Oris selected this measurement to maintain balanced proportions on the 45.50mm case whilst ensuring both aesthetic stability and wearing comfort. Always verify the measurement between the two spring bars before ordering a replacement strap.

The choice depends on intended use. For professional diving or intense aquatic activities, we recommend FKM rubber (fluoroelastomer) or high-density polyester NATO. For daily elegant wear, a vegetable-tanned alligator or pull-up calf strap provides equilibrium between functionality and refinement. The ceramic bezel requires no special protection, unlike traditional metal movements.

Position the watch on a soft surface. Locate the small spring bars on either side of the case: using a dedicated spring bar tool, apply gentle pressure to retract the spring, sliding the pin from the original lug. Insert the pin of the new strap into the same hole and release slowly. Repeat on the opposite side. The procedure demands patience—never force the mechanism.

Yes, all straps with a 22mm lug width are compatible. Milanostraps produces 22mm straps tested on sports models: leather, NATO and rubber fit the case lugs perfectly. We recommend verifying strap thickness (typically 4.5–5.5mm for sports watches) to avoid deployment clasp closure defects.

Under normal conditions, a quality leather strap (alligator or calf) lasts 18–36 months before replacement becomes necessary. Frequent exposure to salt water, chlorine, or direct sunlight significantly shortens lifespan. We recommend always drying the strap after water contact and storing it away from humidity. Vegetable-tanned leather develops a fascinating patina with age and does not deteriorate like industrially tanned alternatives.