Certina · DS-1

Strap for DS-1 Skeleton Stainless Steel / Silver / Mesh

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
ReferenceC029.907.11.031.00
FamilyDS-1
MovementETA caliber C07.631 Hours, Minutes, Seconds
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-1 C029.907.11.031.00

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The DS-1 C029.907.11.031.00, seen from the bench

The Certina DS-1 reference C029.907.11.031.00 is equipped with the ETA C07.631 caliber with indication of hours, minutes and seconds. The watch features 20mm lugs for the strap. The movement offers the essential time functions in a three-hand configuration.

Frequently asked questions

What is the lug width of the Certina DS-1 C029.907.11.031.00?

The lug width (ansa) of the Certina DS-1 C029.907.11.031.00 is exactly 20mm, measured between the inner edges of the case lugs. This measurement is essential for selecting compatible straps: an 18mm strap would create excessive visual gaps, whilst 22mm would introduce undesirable mechanical play. When purchasing an artisanal strap, always verify that "20mm" is specified in the product specifications.

Which strap is best suited for the Certina DS-1 C029.907.11.031.00?

The choice depends on intended use. For formal elegance: alligator leather or shell cordovan with vegetable tanning. For balanced daily wear: vegetable-tanned calf in cognac or dark brown tones. For military or outdoor environment: NATO strap in 4-rings canvas, grey or black. For wet or underwater conditions: vulcanised rubber, black. The DS-1 is versatile—each material emphasises a different aspect of its instrumental character.

How do you change the strap on a Certina DS-1?

The Certina DS-1 features standard straight bar lugs. Proceed as follows: 1) remove the watch from your wrist; 2) using a dedicated spring bar tool, gently press the lateral spring mechanism on the lug; 3) slide the lug out of its slot on the case; 4) repeat on the other side. To fit the new strap, reinsert the lugs into their respective slots from both sides, ensuring the spring mechanism locks fully.

Can I use an aftermarket compatible strap on this model?

Yes, provided it has a 20mm lug width. Milanostraps.it offers a collection of artisanal 20mm straps in various materials (leather, NATO, rubber), all engineered to guarantee mechanical compatibility and constructive quality on cases like the Certina DS-1. Verifying the technical specifications of the product is essential: Certina does not employ proprietary fastening systems.

How long does a leather strap last on a watch worn daily like the DS-1?

A quality artisanal vegetable-tanned leather strap typically lasts 3–5 years with daily wear, developing a natural and captivating patina over time. Durability varies according to: ambient humidity (very humid environments accelerate wear), maintenance frequency (gentle cleaning with a soft cloth monthly extends lifespan), material choice (shell cordovan is more resistant than standard calf). NATO and rubber straps last 2–4 years. Investing in an artisanal strap means also enjoying its aesthetic evolution, not merely its function.

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