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Hamilton Khaki Navy Frogman Auto 41mm Mens Watch Black
Ref. H77455330
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Stepping up in the same colour and case shape
The Frogman name traces back to Hamilton's history of supplying military divers, and this generation of it carries that brief seriously. The crown guard — that bridge-shaped steel arch — is borrowed directly from the original design, and it remains the detail that most immediately marks this watch out from a standard screwdown crown. At 13.09mm thick, the case is notably slim for something rated to 300 metres, which means it clears a cuff rather than catching on one, and sits against the wrist without the bulk that serious depth ratings usually demand. The waved rubber strap is functional rather than decorative: the texture gives grip when the wrist is wet and the pin buckle keeps the fit precise under a drysuit sleeve. The H-10 inside runs on a Nivachron balance spring — an alloy that resists both magnetic fields and temperature swings, which matters on a watch likely to be worn near compasses, computers and cold water. The 80-hour power reserve, displayed on the dial, means a weekend away need not involve remembering to wind it on Friday night.
- Reference
- H77455330
- Brand
- Hamilton
- Case size
- 41mm
- Case thickness
- 13.09mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- H-10
- Functions
- Power reserve indicator
- Water resistance
- 300m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- Super-LumiNova
- Retailer
- Goldsmiths
Additional specifications
- Power reserve
- 80 hours
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 300m it is rated for swimming, snorkelling and recreational diving.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How 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?
20mm. 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.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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