Strap for Rectangular Diamonds 24 Stainless Steel / Blue MOP

The lug width (or case width measurement) of the Oris Rectangular 01 561 7536 4955-07 5 16 91FC is 16mm. This is a relatively uncommon size in contemporary watchmaking, deliberately chosen to maintain the balanced proportions of the compact 24mm rectangular case. To verify this measurement accurately, use a digital calliper positioned between the two internal attachment pins, measuring point to point.

The ideal strap material depends on intended usage. For formal and professional occasions, an alligator strap with fine grain in dark brown or black represents the most elegant and design-coherent choice, honouring the watch's Art Déco aesthetic. For daily wear, vegetable-tanned leather in vintage tones (light brown, tobacco) develops a compelling patina over time. For sportier and casual styles, a NATO strap in reinforced gabardine or a dark grey rubber model preserves the clean geometry without overwhelming the compact case silhouette.

The strap is changed by removing the attachment pins (the two metal bars that secure the strap to the case). Use a spring bar tool (a professional tool for strap removal) to gently push the small elastic clasp on one of the pins inward, allowing you to extract the pin from the case. Repeat on the other side. To install the new 16mm strap, insert the pin into the case lug hole and ensure the elastic clasp clicks securely into position. If unfamiliar with this procedure, consult a professional watchmaker to avoid damage.

Yes, third-party aftermarket straps compatible with 16mm lug width do exist. Milano Straps offers a specialised collection of artisanal straps in various materials (leather, alligator, NATO, rubber) specifically engineered for this uncommon lug width. It is critical to verify that any strap is certified for 16mm compatibility, as this width is non-standard and compatibility is essential. 14mm or 18mm straps will not fit correctly.

The lifespan of a natural leather strap varies depending on material quality, intensity of use, and maintenance practices. A high-quality vegetable-tanned leather strap can last 3 to 7 years with regular wear, whilst developing a compelling patina and texture that enhance its aesthetic value. Alligator, being more durable and less porous, typically lasts longer (5–10 years). To extend useful life, avoid prolonged exposure to extreme humidity, periodically clean with a dry soft cloth, and occasionally apply protective oils designed for leather (never excessively). Periodic strap replacement is nonetheless recommended both to vary style and refresh the watch's overall appearance.