Hamilton · Jazzmaster

Strap for Jazzmaster Open Heart 40mm Black Dial

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
ReferenceH32565735
FamilyJazzmaster
MovementETA caliber 2824-2 Hours, Minutes, Seconds | Date
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 H32565735

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Jazzmaster H32565735, seen from the bench

The Hamilton Jazzmaster H32565735 Open Heart 40mm embodies American watchmaking spirit from the 1960s reinterpreted through a contemporary lens. This model features a clean dial, impeccable legibility, and a 40mm stainless steel case with polished and brushed finish. It houses an ETA Caliber 2824-2 automatic movement visible through the exhibition caseback, beating at 28,600 oscillations per hour with date and hours-minutes-seconds functions. The 20mm lug width is essential for proper strap compatibility and aesthetic balance.

Frequently asked questions

What is the exact lug width of the Hamilton Jazzmaster H32565735?

The lug width of the H32565335 is 20mm. This measurement is determined by the internal distance between the pins that support the strap on the case. For accurate verification, position a calliper between the two lugs: the measurement must be precisely 20mm. This dimension does not allow for tolerances and ensures correct fitting of any dedicated strap.

Which strap is most suitable for the Jazzmaster H32565735?

For a watch of this category, we recommend alligator in vegetable tanning or calf leather with vegetable finishing for formal wear, or a cotton NATO for casual and sports contexts. Shell cordovan represents an ideal intermediate solution for those desiring versatility. Your choice depends on predominant use and personal aesthetic preferences.

How do I change the strap on my Hamilton Jazzmaster H32565735?

Hold the watch with the case facing upwards and locate the two fixing pins on the crown. Using a dedicated tool (spring bar tool), gently press towards the centre of the case to retract the pin spring, then withdraw the old strap. Insert the new strap, aligning the hole to the pin, and press until you hear a 'click' of engagement. Verify that both pins are securely fastened before wearing the watch.

Can I use aftermarket or non-original straps on my H32565735?

Absolutely. The H32565335 accepts any quality strap manufactured with a 20mm lug width, regardless of the manufacturer. Artisanal leather, NATO and rubber straps are fully compatible, often offering superior finishes and customisations compared to OEM straps. It is always important to verify the exact width before purchasing.

How long does a leather strap last on the Hamilton Jazzmaster H32565735?

A quality leather strap with vegetable tanning typically lasts between 3 and 7 years of daily use, depending on frequency of use, climatic conditions and maintenance. An alligator or shell cordovan strap tends to last longer owing to the robustness of the material. The patina that develops over time is normal and imparts character. To extend service life, avoid prolonged exposure to moisture and direct sunlight.

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