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The Khaki Navy Scuba Auto 40mm is Hamilton's entry point into dive-adjacent tool watches: 100m rated, aluminum unidirectional bezel, powered by the H-10 automatic. Where the BeLOWZERO goes deep with helium escape and a full diver's profile, the Scuba wears more like a field watch that borrowed dive watch DNA. The canvas strap option makes that character explicit, and the price keeps it honest.
Hamilton introduced this reference in 2018 as a mid-tier option between the quartz Scuba and the more capable BeLOWZERO. The movement is the H-10, Hamilton's branded version of the ETA C07.611, a reliable workhorse with an 80-hour power reserve. No major generational overhauls since launch; the reference has remained consistent in case dimensions and dial layout.
The 40mm diameter and relatively modest 100m rating position it deliberately as a crossover piece rather than a dedicated diver.
Confirm the reference number is H82335131 and not a closely adjacent Scuba variant with a different dial color or strap configuration, as Hamilton uses long numeric codes that can be easy to transpose. The aluminum bezel insert scratches readily; check for gouges or fading around the pip at 12 o'clock, as replacement inserts add cost. At 100m water resistance this is a swimming watch, not a scuba watch in any practical sense, so inspect crown seals on pre-owned examples that saw water use.
The canvas strap is a NATO-style option that can be swapped, but verify the original bracelet or rubber strap is included if the seller is advertising a complete set.
New retail sits roughly in the $700-850 range depending on strap configuration, and the secondary market reflects that closely with little premium. Pre-owned examples in good condition typically trade at a modest discount to retail, making it one of the few modern automatics where buying new is not a significant penalty. Demand is steady but not speculative; this is a utility purchase, not a collector flip.
The H-10 (ETA C07.611) carries an 80-hour power reserve and is generally reliable. Hamilton recommends service intervals of around 5 years, with independent watchmakers typically quoting $200-350 for a full service on this movement. Water resistance resealing should be done at every service if the watch sees any water exposure.
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Unidirectional bezel operation is the fastest functional check; a bezel rotating in both directions has a failed ratchet.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Unidirectional bezel rotation | Bezel rotates counterclockwise only with a firm click per position; clockwise rotation resisted | Bezel rotates freely in both directions indicating ratchet failure |
| crown | Screw-down crown engagement | Crown threads down smoothly and seats flush against the case; no play or wobble when locked | Crown that does not thread down fully, wobbles when locked, or feels loose indicating worn threads |
| dial | Lume aging consistency between dial and bezel | Lume color on dial indices and bezel pip closely matched, consistent with the watch age |
| Significantly different lume colors between dial and bezel indicating bezel or dial was replaced |
