Hamilton Jazzmaster Open Heart Auto H32705731
Ref. H32705731 · Black dial · In production
- Case42 mm
- Thick11.44 mm
- Water res.50 m
- MovementAutomatic
- CrystalSapphire
Hamilton Jazzmaster Open Heart Auto H32705731 size, specs and price at a glance
The Hamilton Jazzmaster Open Heart Auto H32705731 is 42 mm wide and 11.44 mm thick. Hamilton does not publish its lug-to-lug length. It takes 22 mm straps and ships on a leather strap. Inside is the H-10 automatic calibre, water resistant to 50 m. US list price: $1,245 when we last checked hamiltonwatch.com (3 Nov 2026).
Strap shopping? See our Hamilton lug width chart.
Overview
The Hamilton H32705731 is a dress watch from the Jazzmaster collection, part of the Jazzmaster Open Heart Auto family. It has a 42 mm stainless steel case, 11.44 mm thick. Hamilton lists the dial as black. Inside is an automatic movement (calibre H-10) with 80 h of power reserve. You also get 50 m water resistance, a sapphire crystal and a leather strap.
Who it suits
- Wrists of roughly 16.8–18.7 cm (6.6–7.4 in), by our Watch Finder sizing guide
- Desk and dress wear (keep it away from swimming)
- Shirt cuffs and smarter dress codes
Strengths
- Sapphire crystal resists scratches
- 80 h power reserve survives a weekend off the wrist
Trade-offs
- Only 50 m water resistance: splash-proof, not for swimming
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 42 mm | hamiltonwatch.com · 3 Nov 2026 |
|---|---|---|
| Thickness | 11.44 mm | hamiltonwatch.com · 3 Nov 2026 |
| Lug-to-lug | Not published by Hamilton | |
| Case material | Stainless steel | hamiltonwatch.com · 3 Nov 2026 |
| Crystal | Sapphire | hamiltonwatch.com · 3 Nov 2026 |
| Water resistance | 50 m | hamiltonwatch.com · 3 Nov 2026 |
Dial
| Dial colour | Black | hamiltonwatch.com · 3 Nov 2026 |
|---|
Movement
| Movement type | Automatic | hamiltonwatch.com · 3 Nov 2026 |
|---|---|---|
| Calibre | H-10 | hamiltonwatch.com · 3 Nov 2026 |
| Power reserve | 80 h | hamiltonwatch.com · 3 Nov 2026 |
Strap / Bracelet
| Bracelet / strap | Leather strap | hamiltonwatch.com · 3 Nov 2026 |
|---|---|---|
| Lug width | 22 mm | hamiltonwatch.com · 3 Nov 2026 |
Other
| US list price (MSRP) | $1,245 | hamiltonwatch.com · 3 Nov 2026 |
|---|---|---|
| Production status | In production | hamiltonwatch.com · 3 Nov 2026 |
| Style (our classification) | Dress | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
Variants with the same specs
Same case, movement and bracelet or strap; typically a different dial or finish.
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Questions about the Hamilton Jazzmaster Open Heart Auto H32705731
How big is the Hamilton Jazzmaster Open Heart Auto H32705731?
The case is 42 mm wide, 11.44 mm thick.
What movement does the Hamilton Jazzmaster Open Heart Auto H32705731 use?
It uses the H-10 calibre, a automatic movement with 80 h of power reserve.
Can I swim with the Hamilton Jazzmaster Open Heart Auto H32705731?
Not really. It is rated to 50 m.
How much is the Hamilton Jazzmaster Open Heart Auto H32705731?
The US list price was $1,245 on hamiltonwatch.com when we checked on 3 Nov 2026. Prices change, so check before you buy.
Will the Hamilton Jazzmaster Open Heart Auto H32705731 fit my wrist?
By our sizing guide it sits best on wrists of about 16.8–18.7 cm (6.6–7.4 in). Use the fit checker on this page to test your own wrist.
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