Hamilton · Jazzmaster

Strap for Jazzmaster Viewmatic Skeleton Auto Stainless Steel / 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
ReferenceH42555751
FamilyJazzmaster
MovementHamilton caliber H-10-S hours, minutes, seconds | skeleton
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 Jazzmaster H42555751

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Jazzmaster H42555751, seen from the bench

The Hamilton Jazzmaster H42555751 is a sports chronograph from the Swiss-American brand's collection, featuring a 40 mm stainless steel case with a 20 mm lug width. The model is powered by the Hamilton H-10-S skeleton movement, visible through a sapphire caseback, displaying hours, minutes, seconds and chronograph function. The satin-finished steel case resists oxidation and develops a natural patina over time, designed for practical daily use and professional environments.

Frequently asked questions

What is the lug width of the Hamilton Jazzmaster H42555751?

The lug width of the Hamilton Jazzmaster H42555751 is 20 mm. This dimension is specific to the model and corresponds to the distance between the two metal lugs that secure the strap to the case. It is essential to verify this measurement before purchasing an aftermarket strap to ensure perfect compatibility and prevent lateral play.

Which strap is best suited to the Hamilton Jazzmaster H42555751?

The Jazzmaster H42555751, given its sport-elegant nature with a skeleton movement, pairs magnificently with premium leather straps such as shell cordovan or vegetable-tanned calf, which develop a natural patina over time. For more intensive daily use, heavy cotton NATO or vulcanised rubber straps offer durability and practicality whilst maintaining aesthetic rigour. The choice depends on the intended use: formal, urban-casual, or sporting.

How do you change the strap on a watch with 20 mm lugs?

To change the strap on a watch with 20 mm lugs, position the timepiece on a stable surface and use a spring bar tool (small pin pusher) or a small flat implement to gently depress the pins from the inside of the case. The pins will slide out, freeing the used strap. Insert the new strap by aligning the holes with the pin seats and push them through until the final click engagement. Verify that the strap adheres symmetrically on both sides.

Can I use an aftermarket strap on a Hamilton Jazzmaster H42555751?

Absolutely yes. Any strap with a 20 mm lug width is compatible with the H42555751, provided it is manufactured to appropriate construction quality. Artisanal straps from milanostraps.it, custom-made with Italian leather finishes, African alligator, and selected textiles, guarantee superior quality to the original Hamilton strap, particularly in terms of patina development over time and customisation options.

How long does a leather strap last on a daily-worn watch?

A quality leather strap, with vegetable tanning and artisanal construction, typically lasts 3–5 years with moderate daily wear. Longevity depends on factors such as frequency of wear, ambient humidity, sun exposure, and maintenance. Shell cordovan or alligator straps, being more structured leathers, have superior longevity (5–7 years). Periodic treatment with specific leather balms significantly extends the strap's useful life.

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