Strap for Aquis Date 39.5 Stainless Steel / Green / Rubber

The Oris Aquis 01 733 7732 4157-07 4 21 64FC features a lug width of 21mm, determined by the integrated lug architecture. This dimension is measured from the centre of one lug to the centre of the other, perpendicular to the longitudinal axis of the case. Precision in this measurement is essential to ensure compatibility with aftermarket artisanal straps, avoiding structural stress or undesirable oscillation.

The choice of strap depends on intended usage. For diving applications or summer wear, a high-density synthetic rubber strap is ideal as it resists salt water and maintains flexibility. For everyday elegant contexts, a superior quality calf leather strap with vegetable or animal-free tanning offers comfort and develops patina over time. A natural alligator strap, with its characteristic grain, emphasises the status of the timepiece, whilst NATO canvas straps offer versatility and rapid replacement practicality.

Changing the strap on an Aquis with integrated lugs requires a quality spring bar remover tool: insert the thin blade under the lug spring, compressing it gently to release the pin. Proceed methodically on both sides, avoiding abrupt movements that could scratch the case. Once the strap is removed, inspect the spring pins—they should be perfectly smooth and free of oxidation. Seat the new strap by aligning the holes with the pins, then compress the spring until you hear the locking click.

Yes, any artisanal strap with a 21mm lug width is compatible with this model, provided the internal diameter of the lugs matches the external diameter of the spring pins (typically 1.8-2mm). Milano Straps are specifically constructed to respect these tolerances, guaranteeing application without stress and structural longevity superior to standardised industrial straps.

A natural leather strap of artisanal quality, exposed to moderate daily wear, maintains structural integrity for 18-36 months, depending on ambient humidity, solar exposure and maintenance frequency. Leather with vegetable or animal-free tanning ages by developing a natural patina that increases aesthetic value over time. Synthetic rubber, conversely, maintains stable physical characteristics for 4-5 years before showing signs of elastic degradation. NATO canvas straps, given their multi-layer construction, offer durability exceeding 5 years under normal usage conditions.