Marathon Arctic OSAR 46mm AutomaticvsSeiko Prospex Marinemaster 1968 Heritage Diver's Watch

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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.

Marathon Arctic OSAR 46mm Automatic at true scale

Arctic OSAR 46mm Automatic

Seiko Prospex Marinemaster 1968 Heritage Diver's Watch at true scale

Prospex Marinemaster 1968 Heritage Diver's Watch

Diameter

46mm

42.6mm

Lug-to-Lug

n/a

49.3mm

Thickness

13mm

lowest

13.4mm

Water Resistance

300m

300m

Power Reserve

n/a

50h

MSRP

$2,500

lowest

$2,900

Movement

Sellita SW220-1

Seiko 8L35

Case

5 specs
Diameter
46mm
42.6mm
Thickness
13mm
13.4mm
Lug-to-Lug
n/a
49.3mm
Lug Width
18mm
20mm
Material
316L Stainless Steel
Stainless Steel

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
White
n/a
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Sellita SW220-1
Seiko 8L35
Power Reserve
0h
50h
Jewels
0
26

Pricing

1 specs
MSRP
$2,500
$2,900
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Reviews

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

Marathon Arctic OSAR 46mm Automatic

Owners praise the Marathon Arctic OSAR 46mm Automatic for its overbuilt toughness and industrial, instrument-like aesthetic, with some preferring the Arctic dial for legibility. One owner notes the MaraGlo luminous paint is likened to sliced eggs. The watch features a Swiss automatic movement and 300M ISO-rated water resistance. Some owners question its rising price and luxury positioning, with one noting poor lume and movement performance. Overall, owners rate the Marathon Arctic OSAR 46mm Automatic highly for its rugged, tool-watch build and legibility.

Seiko Prospex Marinemaster 1968 Heritage Diver's Watch

Owners widely praise the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch for its premium finishing, tool-like appearance, and comfortable wearability, with many highlighting the appealing case shape and 4 o'clock crown position. Reviewers and owners alike note the excellent build quality and Zaratsu-like polishing, with some considering it a refined step up from standard Prospex models. The bezel rotation is described as precise, and the watch is seen as a manageable alternative to larger models. Some enthusiasts question the price point compared to competitors, while others argue the craftsmanship justifies the cost. One owner flagged bezel misalignment as a significant issue for the price. The watch features a stainless steel case with super-hard coating and a black textured dial, powered by the Seiko 8L35 automatic movement.