The Marathon Re-Issue Stainless Steel GP Mechanical (GPM) 39mm is based on the brand’s GG-W-113 field watch which was used in the ‘80s. Compared to many of its competitors, the Marathon was a bit odd in that it utilized a mechanical movement when many others went quartz. For the re-issue, Marathon kept much of the looks and utilitarian functionality intact but modernized the dial to their current standards.

The oddly shaped two-piece case has concave sides, giving it a far more sculptural appearance than is typically found on a field watch, adding to its charm. Coming in at 39mm, it wears smaller than expected thanks to the 44.25mm lug-to-lug and 16mm nylon band. The sapphire crystal gives a clear view of the dial which features a tried-and-true field watch design. Large hour numerals are surrounded by tritium gas tubes, which provide a steady endless glow in low-light situations, and don’t need an external light source to charge.

Inside of the Marathon Re-Issue Stainless Steel GP Mechanical is the Swiss-Made ETA 2801. A manual wound caliber it features 17-jewels, hacks, has a power reserve of approximately 42 hours, and a frequency of 28,800 bph.