Hamilton · Jazzmaster

Strap for Jazzmaster Automatic Chronograph 42 Stainless Steel / Black

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter42 mm
ReferenceH32596731
FamilyJazzmaster
MovementHamilton caliber H-21 [Date] Hours, Minutes, Small Seconds | Date | 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 Jazzmaster H32596731

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Jazzmaster H32596731, seen from the bench

The Hamilton Jazzmaster H32596731 is a 42mm stainless steel 316L automatic chronograph featuring the H-21 manual-wind movement with 17 jewels and 28,800 vph frequency. It displays classic chronograph subdials at 6-9-12 positions with applied Arabic numerals, sapphire caseback, and 100m water resistance. The 40-hour power reserve and ±10 seconds/day accuracy are standard for mechanical chronographs in this category. The 22mm lug width is proportionally matched to the 42mm case diameter, ensuring balanced aesthetics on typical wrists.

Frequently asked questions

What is the lug width of the Hamilton Jazzmaster H32596731?

The lug width is 22 millimetres, a specification engineered to maintain proper proportions between the 42mm case and the wrist. This 22mm standard ensures visual balance and compatibility with a broad range of aftermarket strap options.

Which strap is most suitable for the Hamilton Jazzmaster H32596731?

Selection depends on intended use: alligator or vegetable-tanned leather delivers formal elegance and develops an authentic patina over time; NATO webbing in Cordura provides practicality and interchangeability; FKM rubber suits humid environments and sports wear. For this 42mm chronograph, we recommend straps with a minimum thickness of 1.4-1.6mm to maintain balanced proportions.

How do you change the strap on the Hamilton Jazzmaster H32596731?

The H32596731 lugs feature straight, parallel attachments. Using a springbar tool or a small flathead screwdriver, gently compress the tension spring of the lug and extract it from the hole. Once the old strap is removed, insert the new one by seating the springbar into position. The operation takes seconds and requires no specialist knowledge.

Are aftermarket straps compatible with the Hamilton Jazzmaster H32596731?

Yes, any strap manufactured for 22mm lug width is compatible. We recommend verifying that strap thickness is visually coherent with the case mass: excessively thin straps create aesthetic imbalance. Artisanal-quality straps in selected leather or technical fabrics offer superior longevity and finish compared to budget alternatives.

How long does a leather strap last on the Hamilton Jazzmaster H32596731?

Lifespan varies according to material and frequency of wear. A quality alligator or vegetable-tanned leather strap, worn regularly, has a useful life of 3–5 years before requiring replacement or restoration. Constant exposure to humidity, direct sunlight and skin oils accelerates ageing. Rotating multiple straps and occasionally applying neutral conditioner significantly extends longevity.

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