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Hamilton Jazzmaster Open Heart Auto 42mm Steel
Ref. H32705140
Sits in Hamilton’s upper tier here — more premium than three quarters of the Hamilton watches we list, which start at £375.
Price range £375 to £2,265 across 94 Hamilton watches in stock.The 42mm stainless steel case carries a midnight blue aventurine-finish dial with an open-heart cut-out that exposes the movement beneath. Gold-tone arrow indices and luminous gold-tone hands sit against the textured, sparkly surface, with the dial layout incorporating a power reserve indicator. The sapphire crystal features an anti-reflection coating, and the case back is exhibition style. The H-10 calibre is a self-winding Swiss movement with a Nivachron antimagnetic balance spring and an 80-hour power reserve. A brushed and polished multi-link steel bracelet with a folding deployment clasp completes the watch, worn on a 22mm lug width.
- Reference
- H32705140
- Brand
- Hamilton
- Collection
- Jazzmaster
- Case size
- 42mm
- Case thickness
- 11.44mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- H-10
- Functions
- Skeleton dial
- Water resistance
- 50m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Deployant clasp
- Lume
- Luminous
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 80 hours
Learn more about Hamilton
Hamilton was founded in Lancaster, Pennsylvania in 1892, and its early business was the railroad. American rail accidents caused by unsynchronised timekeeping had forced the industry to adopt strict standards, and Hamilton built pocket watches accurate enough to meet them — earning the description the watch of railroad accuracy.
Two things then defined it. The first was war: Hamilton supplied over a million watches to American forces in the Second World War, suspending civilian production entirely, and its marine chronometers were fitted across the US Navy.
The second was electricity. The Ventura of 1957 was the first battery-powered electric wristwatch, and its asymmetric shield-shaped case, designed by Richard Arbib, looked like nothing before it. Elvis Presley wore one in Blue Hawaii.
Hamilton's cinematic presence is unusually deep — over five hundred films — and includes the watches designed for 2001: A Space Odyssey with Stanley Kubrick, and appearances in Interstellar and Tenet.
American manufacturing ended in 1969 as the quartz crisis approached. The brand was acquired by the Swiss and is now part of the Swatch Group, based in Biel, where it occupies a distinctive position: American design heritage, Swiss production, and ETA movements with long power reserves at accessible prices. The Khaki Field, descended from the wartime issue watches, is its best-known line.
- 1892
- Founded in Lancaster, Pennsylvania.
- 1918
- Supplies the first US airmail flights.
- 1957
- The Ventura is the first electric wristwatch.
- 1968
- Designs the watches for 2001: A Space Odyssey.
- 1974
- Becomes Swiss-owned; now part of the Swatch Group.
Also in 5 collections
This watch appears in the Hamilton Jazzmaster range (16), Stainless Steel Watches (3,157), Automatic Watches (1,753), Blue Dial Watches (871) and Skeleton Watches (323).
Manufacturer’s guarantee
Best of 2 retailers
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- Sapphire crystal, which resists scratching
- 80-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
- One of Hamilton's more premium watches
Worth knowing
- 50m suits rain and handwashing, not swimming
Hamilton Jazzmaster Open Heart Auto alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | H32705140 | FC-303NS5B6 | T1394071109100 |
|---|---|---|---|
| Price | £1,065 | £1,095 | £800 |
| Case size | 42mm | 40mm | 42mm |
| Water resistance | 50m | 50m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Leather strap | Stainless steel bracelet |
| Power reserve | 80 hours | 38 hours | — |
| This watch |
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|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Showering yes, swimming no. 50m covers splashes and brief immersion, but a swimming stroke generates well above the pressure that figure describes.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 80 hours fully wound — enough to sit off the wrist over a weekend and still be running.
What size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Cheapest place to buy
Both Goldsmiths and Mappin & Webb list it at £1,065, so choose on delivery and warranty rather than price.
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