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Hamilton Khaki BelowZero Titanium 46mm
Ref. H78505330
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 82 Hamilton watches in stock.The BeLOWZERO began as a prop requirement and became a specification exercise: when Hamilton supplied it to Christopher Nolan's production for Tenet, the brief demanded something credible at extreme depth, and the watch earned its place on screen by meeting that standard in reality rather than merely looking the part. The helium escape valve, the screw-down crown behind its raised protective guards, the 1,000-metre rating — these are working decisions, not aesthetic ones. Titanium at this size carries differently than steel would; 46mm sounds aggressive on paper but the case sits lighter than the numbers suggest, and the all-black PVD finish absorbs light rather than competing with it. The black dial with its Super-LumiNova-treated hands reads cleanly under low light, which is rather the condition it was designed for. The H-10 calibre runs an 80-hour power reserve, useful when a watch spends time in a dive bag or pressure chamber between uses, and the caseback carries an embossed diving mask that acknowledges what the watch is actually for without being theatrical about it.
- Reference
- H78505330
- Brand
- Hamilton
- Case size
- 46mm
- Case thickness
- 15.70mm
- Lug width
- 24mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- ETA C07.611
- Functions
- Power reserve indicator
- Water resistance
- 1000m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- Luminous
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 80 hours
- Weight
- 129g
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 6 collections
This watch appears in Back in Stock (3,988), Automatic Watches (1,546), Watches 44mm and Over (753), Sports Watches (700), Dive Watches (494) and All Black Watches (286).
Best of 2 retailers
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 1000m water resistance, rated for actual diving
- 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
- 46mm is a large watch with real presence
- 15.7mm thick, so it will not disappear under a cuff
Hamilton Khaki BelowZero Titanium alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | H78505330 | 840.10.201.10 | 01 743 7734 4197-SET |
|---|---|---|---|
| Price | £1,785 | £1,890 | £1,785 |
| Case size | 46mm | 42.5mm | 43.5mm |
| Water resistance | 1000m | 1200m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 80 hours | 38 hours | 41 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?
Yes. At 1000m it is rated for swimming, snorkelling and recreational diving.
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?
24mm. 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 Mappin & Webb and Goldsmiths list it at £1,785, so choose on delivery and warranty rather than price.
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