Certina · DS-4

Strap for DS-4 Small Second Silver Bracelet

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter40 mm
ReferenceC0224281103100
FamilyDS-4
MovementETA caliber 2825-2 hours, minutes, small seconds | date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the DS-4 C0224281103100

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The DS-4 C0224281103100, seen from the bench

The Certina DS-4 C0224281103100 is a 40 mm stainless steel sports watch featuring the ETA 2825-2 automatic movement with hour, minute, small second and date functions. It offers 38 hours of power reserve and ±10/-20 seconds per day accuracy. The unidirectional bezel and anti-reflective sapphire crystal reflect Certina's diving heritage. The 21 mm lug width suits medium to athletic wrists and positions this tool watch in the functional sports category rooted in 1950s Swiss watchmaking traditions.

Frequently asked questions

What is the exact lug width of the Certina DS-4 C0224281103100?

The lug width of the Certina DS-4 C0224281103100 is 21 millimetres. This measurement is taken from the internal distance between the two lugs (case shoulders). To verify, use a digital calliper positioned perpendicular to the lugs: the result must be precisely 21 mm. This specification is critical for selecting compatible straps without gaps between the strap passant and the case lug.

Which strap material is best suited for the Certina DS-4 C0224281103100?

The Certina DS-4 C0224281103100 accommodates multiple materials depending on intended use. For formal-sport aesthetics, we recommend natural leather—calf or shell cordovan with vegetable tanning—in cognac or tobacco brown shades. For military and outdoor applications, a woven NATO textile in grey or navy blue maintains visual continuity with the dial's restrained palette. For humid climates and frequent swimming, FKM rubber preserves durability without deterioration. Each choice reflects specific use cases, not mere aesthetic preference.

How do I change the strap on my Certina DS-4 C0224281103100?

Strap replacement on the Certina DS-4 C0224281103100 uses internal spring bars (pressure springs). Procedure: remove the watch, position it face-down on a soft cloth, use a spring bar tool to gently compress the upper spring and slide the bar out of its seat, repeat on the opposite lug. Install the new strap in reverse. If unfamiliar with this procedure, consult a certified watchmaker to avoid case scratches.

Can I use high-quality aftermarket straps on my Certina DS-4 C0224281103100?

Yes, the Certina DS-4 C0224281103100 is fully compatible with quality aftermarket straps, provided the lug width is exactly 21 millimetres. Artisanal leather straps with vegetable tanning, FKM rubber, or NATO textiles of adequate thickness will not damage the case and allow conscious personalisation. Always verify the strap is not under-specified in thickness: undersized straps flex excessively and wear spring bar seats prematurely.

What is the average lifespan of a natural leather strap on the Certina DS-4 C0224281103100?

The lifespan of a vegetable-tanned natural leather strap on the Certina DS-4 C0224281103100 depends on usage intensity and environmental conditions. Under moderate daily use (5–6 days weekly), quality calf lasts 3–4 years before replacement; shell cordovan, owing to superior fibre density, reaches 5–7 years. Exposure to salt humidity, acidic perspiration, or direct UV shortens the cycle. With active care—daily drying, rotation with alternative straps, treatment with leather-specific balms—longevity increases appreciably. A well-constructed strap with robust passant and clasp remains a worthwhile investment.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only