Strap for PRX Powermatic 80 Stainless Steel / Blue Gradient

The lug width (ansa) of the Tissot PRX T137.407.11.051.01 is precisely 12mm. This is a specific, non-standard measurement compared to contemporary 40mm models, which typically feature 14mm, 16mm, or 18mm lugs. To measure correctly, place a digital calliper on the inner shoulder of the lug (where the spring bar seats) to the opposite side. A strap of any other width will not seat properly and poses a safety risk for your timepiece.

The best choice depends on intended use. Alligator leather with fine grain in black or dark brown amplifies the minimalist elegance of the case. Vegetable-tanned calf develops patina and pronounced grain, ideal if you appreciate natural ageing. A sturdy canvas NATO in navy, charcoal, or black honours the model's sporting DNA. Rubber is the radical choice for those seeking contemporary aesthetics. Every material must respect the case's restrained proportions to preserve the geometric dialogue between lugs and buckle.

Strap change requires a spring bar tool (strap removal tool). Insert the flat end of the tool into the opening beneath the lug to compress the internal spring slightly, then gently lift the articulation bar. Repeat on the opposite side. For your new 12mm strap, ensure the lugs have been measured and constructed precisely for this width; even 0.5mm deviation will cause looseness. If inexperienced, entrust the task to a professional to avoid scratching the case or damaging the lugs.

Any strap specifically engineered for 12mm lug width is compatible. Compatibility is not a matter of brand but of construction precision: the strap's lugs (or internal eyelets) must be exactly 12mm wide. Many generic online straps are sized for standard diameters of 14–18mm and will not function. I recommend purchasing from specialised suppliers who explicitly state conformity to 12mm lug width and offer technical documentation or hassle-free returns.

A high-quality leather strap (alligator, vegetable-tanned calf) typically lasts 3–5 years with daily wear, developing characteristic patina and grain. Longevity depends on factors such as frequency of use, sun exposure, humidity, and cleaning discipline. Straps in poor-quality leather or dubiously-sourced exotic materials may degrade faster. To extend lifespan, avoid prolonged moisture, do not fold when damp, and occasionally apply light natural oil. NATO or rubber straps have indefinite lifespan, though rubber may harden over time and NATO may fray at flex points.