Technical Archive

Certina
DS First C0142173305100— lug 17mm

Certina DS First C0142173305100: 17mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

DS First Lady Ceramic Chrono Rose Bracelet

Artisanal Note

"This model requires a precise 17mm lug width to preserve the original sartorial balance."

Lug Width

17 mm

The essential strap measurement.

Browse 17mm straps →

Reference

C0142173305100

Movement

ETA caliber 251.471 Hours, Small Seconds, Minutes | Date | Chronograph

The Heritage

The Certina DS First features the ETA 251.471 caliber with chronograph, hour, minute, small second and date functions. The watch has 17mm lugs and is part of the brand's DS collection. The movement offers standard chronograph complications with date indication.

FAQ

What is the exact lug width of the Certina DS First C0142173305100?

The lug width of the Certina DS First C0142173305100 is 17 mm, a specification that requires straps constructed to this precise geometry. It is essential to measure correctly by positioning callipres between the two spring bars of the case to ensure complete compatibility.

Which strap is most suitable for the Certina DS First C0142173305100?

The ideal strap depends on usage: for formal contexts we recommend alligator with vegetable tanning, which develops patina over time and adds aesthetic depth. For daily versatility, Italian calf offers balanced softness and durability. If you practise water sports, vulcanised rubber guarantees resistance to elements without compromise.

How do you change the strap on a Certina chronograph?

Changing the strap requires a specific tool (spring bar tool) to extract the small bars that hold the strap ends in the case lugs. On models like the C0142173305100, operate with care to avoid scratching the stainless steel case; if you are inexperienced, we recommend consulting a professional watchmaker.

Is an aftermarket strap compatible with the Certina DS First?

Yes, provided it is constructed with a 17 mm lug width. Artisanal compatible straps in leather, alligator, NATO, or rubber ensure the same mechanical security as the original strap, whilst maintaining a more accessible price and permitting chromatic and material variations.

How long does a leather strap last on a chronograph?

A quality calf strap with vegetable tanning lasts on average 3-4 years if subjected to moderate daily use. Alligator resists longer, up to 5-6 years. Longevity depends on humidity, exposure to direct sunlight, and cleaning frequency. The patina that forms is natural and enhances elegance.