I’ve just added another gem to my collection of tritium-illuminated timepieces: the 34mm Black D variant of the GPQ watch. I originally picked it up because I wanted something true to Marathon’s military heritage, compact in size, and affordable compared to their larger SAR models. What I ended up with is a lightweight, tough little field watch.
Design & Aesthetics
At 34mm, the GPQ is small by modern standards, but that’s part of the appeal. The compact fibreshell case gives it a no-nonsense military look, while the dial is clean, legible, and very functional. The 12/24-hour markings are practical, and the tritium tubes ensure that it’s always readable, day or night. On the wrist, it’s extremely light and comfortable, disappearing until you need it — which is exactly what a field watch should do.
I would forget I was even wearing this watch; it was so unobtrusive. Strangely, I also found myself caressing the sides of the watch — they have a nice feel and steep sides. I know, I’m weird. I also do that with my Casio Duroand my NITE Alpha.
I also like the depth inside the dial. Marathon has to make the dial deep to accommodate the tubes on the hands, but the side effect is a neat 3D vibe as you look down into it, like it’s the Rose Bowl or something.
Build Quality
The case is Marathon’s fibreshell material, which makes the watch almost weightless but still rugged. Unlike older GPQs, the “D” version upgrades the crystal to sapphire, which adds a nice touch of scratch resistance. It’s rated for 3 ATM water resistance, so it’s not a dive watch by any means, but it’s plenty for daily wear and light outdoor use. I’ve worn it hiking and during long days out, and it’s held up without issue.
Lume Performance
The T25 tritium tubes are the star of the show. They’re not retina-searing bright like fresh Super-LumiNova, but they don’t fade at all through the night. Waking up in the dark, the watch is always visible. That consistency is something I’ve grown to really appreciate, especially compared to painted lume that die after a few hours.
Movement & Accuracy
Inside is a Swiss quartz movement (ETA F06 in this case), and it’s as reliable as you’d expect. Accuracy is excellent — I barely need to reset it. Battery life is several years, which is one of the reasons I like it as a grab-and-go watch. No winding, no worrying, just set it and wear it.
Practicality & Comfort
This is where the GPQ shines. Because it’s so lightweight, it’s the definition of “forget it’s there” comfort. The included strap is serviceable, though not my favorite, so I’ve swapped it out for a NATO and a Marathon NAV strap at times. Both wear great. For long days, especially in the heat, the GPQ is way more comfortable than heavier steel watches.
Specifications
| Specification | Details |
|---|---|
| Model | Marathon GPQ-D (General Purpose Quartz – Date) |
| Case Diameter | 34 mm |
| Case Material | Fibreshell, high-impact, matte finish |
| Case Thickness | ~11 mm |
| Lug Width | 16 mm |
| Weight | ~30 g (very lightweight) |
| Crystal | Sapphire (upgrade from older acrylic versions) |
| Dial | 12/24-hour format, date window at 4:30 |
| Lume | Tritium gas tubes (self-powered, constant glow) |
| Movement | ETA F06 High-Torque Swiss Quartz |
| Accuracy | ± 20 seconds/month |
| Battery Life | Approx. 5 years (with end-of-life indicator) |
| Water Resistance | 3 ATM / 30 m (splash-resistant, not for swimming) |
| Strap | 16 mm nylon DEFSTAN strap (often swapped for NATO or NAV-D) |
| Origin | Made in Switzerland, to U.S. Military specifications (MIL-PRF-46374G, Type I, Class 1) |
Pros & Cons
Pros:
- Authentic military heritage and design.
- Lightweight fibreshell case.
- Always-on tritium lume.
- Affordable compared to larger Marathons.
- Scratch-resistant sapphire crystal (on the GPQ-D).
Cons:
- 34mm size is polarizing — great for small wrists, too small for some.
- Plain but very high-quality quartz movement (not solar or mechanical).
- Doesn’t have the premium “feel” of steel cases.
- Limited water resistance.
Compared to my larger Marathon NAV model, the GPQ is more of a pure field watch — simple, light, and built for function rather than luxury. Against brands like Luminox or Traser, the GPQ feels more authentic, since Marathon actually supplies watches to the military. That said, if you want a “big wrist presence” or a mechanical movement, you’ll likely gravitate toward the GSAR or Navigator instead.
The GPQ isn’t trying to be a flashy watch, and that’s exactly why I like it. It’s reliable, tough, and understated — the kind of watch you can wear anywhere without worrying about it. For me, it’s become a great daily beater and a piece of kit I trust. If you want a true military-style field watch with tritium lume and a compact form factor, the GPQ is hard to beat.
Would I buy it again? Absolutely. And while I may eventually move up to another Marathon model, the GPQ earns its place in my collection for being simple, rugged, and true to its roots.
