Hamilton · Hamilton H-14 GMT

Hamilton Khaki Navy Scuba GMT, Converter GMT and Broadway GMT power reserve: inside the H-14

The Hamilton Khaki Navy Scuba Auto GMT, Khaki Aviation Converter Auto GMT and Broadway GMT run on the H-14, Hamilton's GMT version of the H-10. Fully wound, it runs for 80 hours, a little over three days.

Updated September 2026 · Based on manufacturer specs, published reviews and watchmaker/owner reports

Watches that use the Hamilton H-14

The H-14 is Hamilton's travel movement: the 80-hour H-10 with a 24-hour GMT hand added. It's used in a small number of models, so this list is short. Hamilton's older GMTs used the ETA 2893-2 instead, so check the reference before assuming 80 hours.

Not an H-14: the earlier Khaki Aviation Pilot GMT Auto (H76755135), which Hamilton lists with the ETA 2893-2 and a 50-hour reserve. If you own that watch, the 80-hour figures on this page don't apply.

Specs at a glance

History and where it came from

Hamilton's GMT watches used to run on the ETA 2893-2, a 4 Hz GMT version of the 2824 with a reserve in the low 40s of hours (Hamilton quoted 50 hours for its Khaki Pilot GMT). The H-14 brought the brand's travel watches into line with the rest of its 80-hour family.

Monochrome's coverage of the 2020 Khaki Aviation Converter collection describes the H-14 as the GMT version of the H-10, with a 3 Hz frequency, an upgraded gear train and a more powerful mainspring for 80 hours. The Broadway GMT Limited Edition, a 46mm travel watch with a 24-city bezel, was one of the first models to carry it.

In 2025 the H-14 reached Hamilton's most popular dive line with the Khaki Navy Scuba Auto GMT. Monochrome lists it as a Powermatic 80-based movement with a Nivachron balance spring, and in 2026 Hamilton added new dial colours and textures to the Scuba GMT range.

Accuracy in the real world

Hamilton doesn't publish an accuracy figure for the H-14, and none of these GMTs is chronometer certified. Since the timekeeping side is the same C07 base as the H-10, you'd expect similar results: single-digit seconds a day is typical for the H-10, with some variation between watches. The H-14 is a much less common movement, so there are fewer owner reports to go on.

For a traveller, the Nivachron balance spring matters more than a second or two a day. Airport scanners, laptop bags and magnetic phone cases are common reasons for a watch to suddenly start gaining minutes, and the Nivachron spring is designed to resist that. If a Scuba GMT does start running wildly fast after a trip, have it checked for magnetism before assuming a fault.

Reliability and servicing

There's no known systemic fault with the H-14, and its base is the well-proven C07. The GMT module adds parts, so it's a little more complex than an H-10, and it's also rarer. That rarity is the main servicing consideration.

Swatch Group restricts parts for its C07 movements, and Hamilton's service network may swap the movement rather than overhaul it. Independent watchmakers are less likely to have H-14 parts than H-10 parts. For a Scuba GMT or Converter GMT, plan on brand service, and keep an eye on the reserve and rate rather than servicing on a fixed schedule.

Quirks worth knowing

• How the GMT hand sets. Monochrome describes the 2025 Scuba GMT as a "true" or traveller's GMT with an independently adjustable local hour hand, while its 2020 Converter coverage describes adjusting in one-hour steps from the crown. Check your watch's manual for which crown position moves which hand.
• Date and time zones. On a traveller's GMT, jumping the local hour hand forward or back past midnight also moves the date. That's convenient on a trip but a surprise the first time.
• The date danger zone. Avoid quickset changes to the date late in the evening while it's changing over. Here's why.
• Slow to fill. From a stop, give it 30 to 40 crown turns before putting it on.

How it compares

• ETA 2893-2. The older Swiss GMT used in earlier Hamilton GMTs. Faster 4 Hz beat and easier independent servicing, but about half the reserve.
• H-10. The same base without the GMT hand, in the 40mm Khaki Navy Scuba Auto and Khaki Field Auto. Same 80 hours.
• Powermatic 80. Tissot's name for the same base family. Same 3 Hz beat and 80 hours, without the GMT hand.
• Sellita SW330. The common Swiss GMT alternative in many microbrand watches, with a 4 Hz beat and a reserve well short of 80 hours.

Living with the 80-hour reserve

On a GMT watch, a stop is doubly annoying: you have to reset the local time, the home time and the date. The H-14's 80 hours make that much rarer. Take your Khaki Navy Scuba GMT off at 6pm on Friday and, if it was fully wound, it's still running at 2am on Tuesday with both time zones intact.

It also suits the way people use travel watches. A GMT often comes out for a trip and sits in the drawer between them. It will survive a long weekend, but not a two-week gap. Watch Winder counts down the reserve for each watch you own and reminds you before it stops, so you can top up the Scuba GMT before it loses your home time. To check a specific gap, try the "Will my watch stop?" calculator.

Verdict

The H-14 gives Hamilton's travel watches the same practical advantage as the rest of its range: 80 hours of reserve and a Nivachron spring that resists magnetism. That makes the Khaki Navy Scuba GMT one of the more practical GMT watches at its price. The trade-offs are no published accuracy spec, fewer owner reports than the H-10, a slower 3 Hz sweep, and servicing that realistically means the Swatch Group network.

FAQ

How long does the Hamilton Khaki Navy Scuba GMT run off the wrist?

About 80 hours when fully wound, a little over three days. That's enough to keep both time zones set through a weekend in the drawer.

What movement is in the Hamilton Khaki Navy Scuba Auto GMT?

The H-14, a GMT version of Hamilton's H-10 based on the Powermatic 80, with a 3 Hz beat, an 80-hour reserve and a Nivachron balance spring.

Is the Hamilton Khaki Navy Scuba GMT a true GMT?

Monochrome describes it as a true traveller's GMT with an independently adjustable local hour hand, so you move the local hour to the new time zone while the 24-hour hand keeps home time.

What movement is in the Khaki Aviation Converter Auto GMT?

The Converter Auto GMT uses the H-14 with an 80-hour reserve. It's the GMT version of the H-10 used in the three-hand Converter.

Does the Hamilton Khaki Pilot GMT have the H-14?

No. Hamilton lists the older Khaki Pilot GMT Auto, reference H76755135, with the ETA 2893-2 and a 50-hour reserve.

How accurate is the Hamilton H-14?

Hamilton doesn't publish an accuracy spec. It shares its timekeeping base with the H-10, which owners typically report running within single-digit seconds a day.

Why did my Hamilton GMT stop between trips?

An 80-hour reserve covers a long weekend but not weeks unworn. Wind it 30 to 40 turns after a stop and reset the local time, home time and date.

Sources

• Monochrome: Hamilton Khaki Navy Scuba Auto GMT
• Monochrome: new dials for the Khaki Navy Scuba and Scuba GMT
• Monochrome: Hamilton Khaki Aviation Converter collection
• Hamilton: Khaki Aviation Converter Auto GMT H76715140
• Hamilton: Broadway GMT Limited Edition H43725131

Keeping it running

• On an average day an automatic gains roughly 4 hours of reserve per hour on the wrist, so about 20 hours of wear fills the Hamilton H-14 GMT. Desk days charge more slowly.
• Most automatics can also be wound by the crown. If yours has stopped, a few dozen turns gets it going before you put it on.
• Off the wrist it stops about 80 hours after it was last full. Stopped sooner?
• On a watch winder, start at about 650 turns per day, both directions. Winder settings for every movement.
• If it does stop, don't set the date between 9pm and 3am. Check if it's safe.

All Hamilton movements · Other 80-hour movements

Never let it stop

Watch Winder counts down the reserve of every watch you own and reminds you before one stops. It already knows the Hamilton H-14 GMT: type your watch's name and the reserve fills itself in.

Manufacturer's published figure. Real reserve varies with the watch's age and service; check your manual.