Strap for DS Action 34.5 Powermatic Stainless Steel - Yelllow Gold / Black MOP

The lug width of this reference is 15 millimetres, a non-standard measurement common in vintage Certina production. To verify it, insert a caliper between the two lugs (from the 6 to the 12 o'clock position) and measure the internal distance: it should be exactly 15mm. This atypical dimension requires careful selection when sourcing a compatible strap.

The choice depends on intended use and aesthetic preference. For everyday elegance, we recommend vegetable-tanned alligator in medium brown: it develops natural patina and emphasises the tool watch vocation. For water sports, military-grade nylon NATO guarantees durability and minimal maintenance. Soft calf leather offers immediate comfort, whilst FKM rubber is ideal for humid or highly formal environments.

Strap replacement is accomplished by removing the spring bars located in the lug attachments. Use a dedicated tool (spring bar tool) to compress the bar on one side and slide it upwards. Once extracted, the old strap releases. Insert the new strap into the lugs, position the spring bar, and slide until it clicks into place. If inexperienced, entrust the task to a professional watchmaker.

Any strap with a 15-millimetre lug width is compatible. You may choose from alligator, calf, shell cordovan, canvas NATO, FKM rubber, or waxed leather, provided the internal attachments (lugs) are correct. On milanostraps.it you will find a curated selection of artisanal 15mm straps, ready for dispatch.

Leather strap longevity depends on material, tanning method, and usage intensity. Vegetable-tanned alligator, worn daily, has an average lifespan of 4–6 years before replacement becomes necessary. Soft calf ages more quickly (2–4 years), whilst shell cordovan resists up to 8–10 years if properly maintained. FKM rubber endures 5–7 years. Periodic oiling (every 6–12 months) significantly prolongs durability.