Strap for DS Super PH500M Stainless Steel / Black / NATO

The lug width of the Certina DS PH C037.407.18.050.00 is 20 millimetres. This measurement represents the internal space between the two attachment pins on the case, measured perpendicularly. Any strap for this model must be precisely 20mm wide to ensure correct fitment and aesthetically pleasing alignment without lateral overhang.

The best strap depends on intended use. For frequent diving, a NATO strap in grey or black nylon offers salt-water resistance and rapid drying. For daily elegant wear, vegetable-tanned alligator in cognac brown creates sophisticated contrast with the blue dial. Rubber straps are ideal for intensive water sports. Milano Straps recommends visiting to trial colour pairings in natural light before purchasing.

The strap is changed by removing the spring bars that connect the strap to the case lugs. Use a spring bar tool to gently compress the pin inward, thereby releasing the strap. This requires patience and clean surfaces to avoid scratches on the case. If unfamiliar with the procedure, Atelier Casati Milano offers professional fitting services by appointment with direct supervision.

Any artisanal strap with a 20mm lug width is compatible with the C037.407.18.050.00, provided it meets precise manufacturing tolerances. Milano Straps provides a selection of 20mm straps verified on this model: alligator, calf leather, shell cordovan in vegetable tanning, and NATO options. All ship promptly and are customisable via our online platform.

Strap longevity depends on tanning method and usage patterns. Vegetable-tanned leather, with proper care (six-monthly conditioning with neutral oil, winter protection), lasts 5–8 years of daily wear. Shell cordovan, being denser and more oleaginous, reaches 10 years. Synthetic NATO straps withstand 3–4 years under extreme conditions. Tropical climates or frequent diving reduce these estimates; annual inspection by a specialist is recommended for intensive use.