Side by side

Marathon GPQ (General Purpose Quartz) Field WatchvsFormex Reef 39.5 mm

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

GPQ (General Purpose Quartz) Field Watch
MarathonGPQ (General Purpose Quartz) Field Watch
MSRP $420
Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230

At a glance

14 of 29 specs differ
Diameter
GPQ (General Purpose Quartz) Field Watch34mm
Reef 39.5 mm39.5mm
Power Reserve
GPQ (General Purpose Quartz) Field Watch40h
Reef 39.5 mm56h
Water Resistance
GPQ (General Purpose Quartz) Field Watch30m
Reef 39.5 mm300m
MSRP
GPQ (General Purpose Quartz) Field Watch$420
Reef 39.5 mm$2,230

Full specifications

Case

7 specs
Category
Field
Diver
Diameter
34mm
39.5mm
Thickness
11.5mm
11mm
Lug-to-Lug
41mm
45.5mm
Lug Width
16mm
22mm
Material
Fibreshell Composite
Stainless Steel
Water Resistance
30m
300m

Crystal & Dial

3 specs
Crystal
Acrylic
Sapphire
Dial Color
Black
Bahama Blue
Lume
None
Super-LumiNova

Movement

3 specs
Caliber
Swiss High-Torque Quartz (3J, EOL)
Sellita SW300-1
Type
Quartz
Automatic
Power Reserve
40h
56h

Pricing

1 specs
MSRP
$420
$2,230

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Marathon GPQ (General Purpose Quartz) Field Watch

Owners widely praise the Marathon GPQ (General Purpose Quartz) Field Watch for its rugged quartz movement, accuracy, and tritium lume. Reviewers and owners alike highlight its solid build, legibility, and comfortable, lightweight wear, making it particularly well-suited for smaller wrists. Some owners, however, consider the price point of $350-420 to be somewhat high. On balance, the consensus is that owners rate the Marathon GPQ (General Purpose Quartz) Field Watch highly for its dependable quartz accuracy and excellent tritium lume.

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

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