Strap for Valiant Auto 40 Stainless Steel / Black

The lug width of the Hamilton Valiant H39515133 is 20 millimetres. This technical specification determines compatibility with any aftermarket strap. It is measured as the distance between the centres of the spring bar holes on the case lugs.

The best strap depends on intended use: for formal elegance, black alligator leather; for evolving patina over time, vegetable-tanned calf in brown; for practicality and swift changes, NATO in Cordura; for humid environments, FKM rubber. The 40mm stainless steel case accommodates all materials harmoniously.

To change the strap: 1) Obtain a spring bar removal tool; 2) Place the watch on a soft surface; 3) Insert the forked end of the tool into the lug hole, pushing towards the centre to compress the spring bar; 4) Extract the bar carefully; 5) Remove the old strap; 6) Insert the spring bars into the new strap; 7) Align and snap the new strap into the lugs. Perform this operation with care to avoid scratching the case.

Yes, any strap with a 20-millimetre lug width is compatible. Milanostraps.it offers a complete selection of 20mm straps in leather, NATO, and rubber, crafted artisanally or industrially, all ready for installation on your Valiant without case modification.

A quality leather strap (calf, alligator, shell cordovan) maintains functionality and aesthetics for 2–4 years of daily wear, varying with climate, perspiration, and maintenance. Vegetable-tanned leather ages gracefully, developing patina. Regular cleaning and air-drying extend lifespan. Replacement depends on aesthetic preference, not structural failure, for well-crafted artisanal straps.