Damasko · Chronographs

Strap for DC 57 Si Black

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
ReferenceDC57.si.black
FamilyChronographs
MovementDamasko caliber 7750 Si Hours, Minutes, Small Seconds | Date, Day | Chronograph
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 Chronographs DC57.si.black

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Chronographs DC57.si.black, seen from the bench

The Damasko DC57.si.black is powered by the 7750 Si caliber with functions of hours, minutes, small seconds, date, day and chronograph. The watch features a German construction with an internally modified automatic movement. 20mm lugs complete the technical specifications of the timepiece.

Frequently asked questions

What is the lug width of the Damasko Chronographs DC57.si.black?

The Damasko DC57.si.black features a 20mm lug width, a precise specification requiring equally accurate replacement straps. To verify the measurement correctly, use a digital calliper to measure the distance between the lugs: a tolerance between 19.8mm and 20.2mm is correct. Do not rely on visual estimates, as minor fractional differences significantly impact strap fit.

Which strap is recommended for the Damasko DC57.si.black?

The ideal strap depends on your intended use. For formal elegance, we recommend alligator in black or dark brown, as the natural grain does not compete visually with the technical dial. For versatile daily wear, vegetable-tanned calf offers comfort and develops an authentic patina over time. For intensive professional contexts (aviation, water sports), FKM rubber guarantees superior waterproofing and chemical resistance. Milano Straps provides personalised sartorial consultation at Atelier Casati Milano by appointment.

How do I change the strap on the Damasko DC57.si.black?

Strap replacement requires a specific tool: a spring bar removal tool used carefully to avoid case scratching. Position the watch on a soft surface, gently push inward the small spring button at the lug ends until the spring retracts, then extract the lug from the case. Repeat on the other side. Reverse the procedure to install the new strap. If unsure, Atelier Casati Milano performs the service by appointment with guaranteed craftsmanship.

Can I use an aftermarket 20mm strap on the Damasko DC57.si.black?

Absolutely. The 20mm lug width is an industry standard used by numerous manufacturers; any strap with a 20mm lug width is mechanically compatible. Aesthetic compatibility, however, depends on your choice: materials, colours and finishes must harmonise with the brushed steel and black dial of the DC57.si.black. Milano Straps crafts artisanal straps in alligator, calf, shell cordovan, NATO and rubber, all available in 20mm with online personalisation and rapid shipping.

How long does a leather strap last on the Damasko DC57.si.black?

Leather strap longevity depends on construction quality, tanning method and usage intensity. An artisanal alligator or calf strap, used daily in normal environments (not chemically aggressive), maintains structural integrity for 18–36 months. Vegetable-tanned leather ages elegantly, developing natural patina without compromising functionality. Stitching (the critical element) on Milano Straps is hand-sewn with superior waxed thread, ensuring greater longevity than industrial production. Intense UV exposure, chemical solvents and prolonged humidity shorten lifespan; in these contexts, FKM rubber represents the most durable alternative.

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