Strap for DS 4 Big Size Two Tone Black

The lug width (misura ansa) of the Certina DS-4 C0226102205100 is 21mm. This measurement represents the internal distance between the lug shoulders and is essential for purchasing compatible straps. You can verify it by using a digital caliper, measuring between the internal contact points where the strap enters the case.

For the Certina DS-4 we recommend three options based on usage: alligator leather tanned with vegetable tannins for formal elegance, Italian calf leather for daily versatility, or grey-blue NATO for recovering the model's military heritage. If you opt for leather, a stainless steel deployante ensures comfort and practicality without aesthetic compromise.

Position the watch on an anti-scratch mat with the dial facing downward. Locate the lateral spring bars (small pins protruding from the lugs). Using an appropriate tool or spring bar removal, gently press the spring towards the centre of the case until it clicks free. The strap will come out freely. Insert the new strap by aligning it with the spring bars, then snap the springs until you hear the confirmation click.

Yes, absolutely. The market for 21mm aftermarket straps is extensive and of high quality. Ensure that the lug width is correct (21mm) and that the material is compatible with stainless steel. Straps in vegetable-tanned leather, rubber and NATO are the most common and reliable choices for this model.

The lifespan of a leather strap depends on frequency of wear and maintenance. A quality artisanal strap in alligator or calf leather, worn daily, maintains structural integrity for 3–4 years, after which it begins to show stress marks in flexing areas. The natural patina that develops is part of the material's character. Rubber and NATO have superior longevity (5–7 years) but more neutral aesthetic character.