Strap for DS-4 Small Second Two Tone

The lug width of the Certina DS-4 (reference C0224282203100) is 21.00mm. This measurement is standard for the 40mm case and is essential to ensure strap compatibility. Any strap with a narrower lug width (20mm) or wider (22mm) will not fit correctly into the factory lugs. For accurate measurement, use a digital calliper positioned perpendicular to the lug at the midpoint between the attachment pins.

For the Certina DS-4, the choice depends on intended use. If you seek elegance and refinement, we recommend alligator or vegetable-tanned calf leather: alligator develops a fascinating natural patina over time, whilst calf with fine grain maintains a more formal appearance. For everyday durability and practicality, treated vitello leather is the ideal solution: it offers sufficient strength for sports and adventures without sacrificing aesthetics. Any of these materials, in 21mm lug width, guarantees perfect compatibility with the C0224282203100.

The Certina DS-4 features removable spring bar pins. To change the strap: place the watch on a soft, stable surface; locate the small access hole for the pin on both sides of the case; use a spring bar tool (often supplied in kits or available separately) and gently push the pin outward. Once the pin is removed, the old strap slides away. Insert the new strap (ensuring the lug width is precisely 21mm) and reinsert the pin from the opposite side until you hear a click. Avoid using improvised tools that might scratch the stainless steel case.

Absolutely. Any strap with a 21.00mm lug width is mechanically compatible with the C0224282203100. Quality aftermarket straps, whether in natural leather, alligator or technical materials such as NATO and rubber, fit without difficulty. The key is to verify the lug width with precision: a beautifully crafted strap of incorrect width will remain unusable. Casati Milano and MilanoStraps offer curated selections of certified 21mm-compatible straps for your Certina.

Durability varies depending on material and usage conditions. A vitello or alligator strap with vegetable tanning, if properly maintained (dried after perspiration exposure, protected from excessive sunlight), can last 3–5 years of daily wear. Natural leather ages, developing patina and minor wear marks that add character, but gradually loses elasticity. NATO fabric straps last longer (5–7 years), whilst vulcanised rubber straps exceed 10 years without significant aging. Casati Milano recommends keeping a backup strap for watches in 21mm lug width to extend the useful life of both.