Certina · DS First

Strap for DS First Lady Ceramic Chrono White Bracelet

Takes 17 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width17 mm
Case diameter35 mm
ReferenceC0142171101100
FamilyDS First
MovementETA caliber 251.471 Hours, Small Seconds, Minutes | Date | Chronograph
CaseCeramic, Stainless Steel

Spring bar

Swiss Standard universal spring bars

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

The DS First C0142171101100, seen from the bench

The Certina DS First C0142171101100 is a 34.80 mm mid-size watch embodying the DS (Double Security) philosophy established in the 1960s. It features a satin steel case with glossy ceramic bezel insert and houses an ETA 251.471 automatic chronograph movement with small seconds and date. The 17 mm lug width is essential for strap replacement and requires precise measurement using a digital caliper positioned perpendicularly between the lugs.

Frequently asked questions

What is the lug width of the Certina DS First C0142171101100?

The lug width of the Certina DS First C0142171101100 is 17 millimetres. This parameter is essential for selecting compatible straps. To verify the measurement, use a digital calliper, positioning the tips perpendicularly between the two lugs of the case: the internal distance must correspond precisely to 17 mm. Even a minimal discrepancy would compromise strap insertion.

Which strap should be paired with the Certina DS First C0142171101100?

The Certina DS First C0142171101100, with its satin stainless steel case and ceramic insert, ideally pairs with vegetable-tanned calf leather straps in dark brown (mahogany or oxblood), satin-finished black alligator for chronograph emphasis, or heavyweight cotton NATO. A shell cordovan strap represents the finest artisanal choice, developing a burnished patina over time. The choice depends on intended use: formal occasions require noble leather; sportive contexts are best suited to FKM rubber or technical fabric.

How do I change the strap on the Certina DS First C0142171101100?

To change the strap, position the watch with the lugs vertical. Using a small screwdriver tip or spring bar tool, gently press upward on the internal spring of the spring bar (the metal pin holding the strap). Simultaneously, pull the outer strap downward: the spring bar will release. Repeat the procedure on the other lug. Insert the new strap by threading the spring bar into its seat, ensuring complete seating. Verify that the strap is secure by pulling it gently.

Does the Certina DS First C0142171101100 accept aftermarket straps?

Yes, the Certina DS First C0142171101100 accepts aftermarket straps provided they strictly respect the 17 mm lug width. Artisanal straps in noble leather (calf, alligator, shell cordovan), technical FKM rubber, or watch-specific textiles are compatible. Avoid straps with undersized (16 mm) or oversized (18 mm) lugs: these would create unwanted play and instability during wear. Always verify the declared lug width from the manufacturer before purchase.

How long does a leather strap last on a Certina DS First C0142171101100?

The durability of a leather strap depends on tanning quality, usage patterns, and maintenance. A quality vegetable-tanned calf strap, worn daily, has an average lifespan of 3–5 years; vegetable-tanned leather develops a noble patina with use. Satin-finished alligator lasts longer (5–7 years) owing to the natural hide structure. Shell cordovan, due to its density and treatment, may exceed 7–10 years with proper care. To extend lifespan: avoid prolonged water exposure, remove dirt with a soft cloth, apply protective balms every 6–8 months, and allow the strap to breathe by alternating wear.

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.

Request an appointment →

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