Marathon JDD (Jumbo Day/Date) Anthracite Diver's AutomaticvsBoldr Odyssey Bronze
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

JDD (Jumbo Day/Date) Anthracite Diver's Automatic

Odyssey Bronze
Diameter
46mm
45.5mm
Lug-to-Lug
55mm
52mm
lowest
Thickness
18mm
16.8mm
lowest
Water Resistance
300m
500m
highest
MSRP
$3,250
$649
lowest
Movement
Sellita SW220-1
Seiko NH35
Case
5 specsCrystal & Dial
3 specsMovement
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic is widely praised as a tough, underrated tool watch with excellent legibility due to its tritium lume. Owners appreciate its robust build and lifestyle appeal, though its 46mm size is a common point of criticism, with some finding it heavy and top-heavy. One reviewer noted the white day/date discs clash with the anthracite dial, and an owner observed the watch running about 10 seconds fast over three days. On balance, owners and reviewers rate the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic highly for its robust build and excellent legibility as a tool watch, despite its substantial size.
The Boldr Odyssey Bronze is praised for its robust, ship-like aesthetic and substantial feel, with its meteorite dial and OEM Horween strap noted as unique features. Owners report the 45.5mm case size and 500m water resistance as significant attributes. Some criticism exists regarding the movement used at its price point, though owners feel the style, fit, finish, and specifications compensate. Overall, owners rate the Boldr Odyssey Bronze highly for its distinctive meteorite dial and robust build at its price point.
The 500m water resistance and Lumicast lume are standout features. The 45mm+ case size is a drawback for some wrists.
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