U.S. Government Issue Navigator Pilot Wristwatch

From the website:
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Type 6, genuine GI quartz tritium vial watch.

Swiss-made heavy-duty full quartz movement.

Water-resistant to 196 feet.

Altitude performance to 35,000 feet.

Case is nylon-fiberglass composite - very durable, nearly indestructible.

Second time zone rotating bezel.

Stainless-steel back has engraved full military markings.

(NSN 6645-01-364-4042)

June 2004 contract.

$165.

Nuclear Regulatory Commission Compliance Notice: All gaseous tritium luminous timepieces entering the United States must pass stringent testing in accordance with guidelines set forth by the U.S. Nuclear Regulatory Commission.

All watches sold by the County Comm have been tested at an independent testing facility and cleared.

At present, only Marathon Watch Company holds the contract to supply gaseous tritium luminous timepieces to the United States Government.
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So it would appear, at least to this observer, that these are the real thing.

A note on tritium luminous watches: a few years ago, I purchased one from some catalog outfit.

Then, along with the watch came a disclaimer that the watches were "erroneously" advertised as containing tritium when, in fact, they didn't.

Why is this so important?

Well, tritium is the gold standard, as it were, for luminous dials.

As such, and because it's dangerous stuff if not used in minuscule quantities and concentration, you want to have tritium providing your night-time illumination and yet not go the Pierre/Marie Curie route and die an agonizing death from radiation poisoning and cancer.