Strap for PRX Powermatic 80 Grendizer U Serie

The lug width of the Tissot PRX T137.407.11.041.02 is 12mm. This is the free space between the two stainless steel lugs measured from the inner side. It is a precise standard that excludes universal straps and requires careful selection from quality strap manufacturers.

The most coherent strap depends on usage: for daily elegance, a dark brown alligator or navy blue aniline calf; for versatility, a charcoal grey NATO; for those who appreciate ageing, a vegetable-tanned calf in cognac colour. The geometric 1970s case benefits from straps that do not compete with its architectural presence.

The change is straightforward: use a spring bar tool to gently push the lug spring inward from the opposite side. Once the metal pin is freed, the strap separates from the case. Reinsert the new strap, aligning the lug to the case, and ensure the pin clicks firmly into position. Avoid hammers and excessive force.

Yes, provided it respects the 12mm lug width. High-quality aftermarket straps (such as alligator, calf or vegetable-tanned leather) are compatible and often superior in terms of materials and finishing compared to OEM straps. Always verify that the attachment is specifically designed for 12mm.

A quality leather strap (alligator or calf) lasts 3–5 years with moderate daily use. Durability depends on frequency of use, sun and humidity exposure, and the tanning method used. A vegetable-tanned strap ages gradually, developing patina whilst maintaining structure. A poorly treated or constantly humid-exposed strap may deteriorate in 18–24 months.