Marathon Arctic OSAR 46mm AutomaticvsSeiko Prospex Sea Save the Ocean Special Edition

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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 Sea Save the Ocean Special Edition at true scale

Prospex Sea Save the Ocean Special Edition

Diameter

46mm

45mm

Lug-to-Lug

n/a

47.7mm

Thickness

13mm

lowest

13.2mm

Water Resistance

300m

highest

200m

Power Reserve

n/a

41h

MSRP

$2,500

$625

lowest

Movement

Sellita SW220-1

Seiko 4R36

Case

6 specs
Diameter
46mm
45mm
Thickness
13mm
13.2mm
Lug-to-Lug
n/a
47.7mm
Lug Width
18mm
22mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
300m
200m

Crystal & Dial

3 specs
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 4R36
Power Reserve
0h
41h
Jewels
0
24

Pricing

1 specs
MSRP
$2,500
$625
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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 Sea Save the Ocean Special Edition

The Seiko Prospex Sea Save the Ocean Special Edition is widely praised for its exceptional and unique dial designs, often described as a highlight with wave patterns, lagoon hues, or even manta rays, offering a "Grand Seiko feel" at a regular Seiko price. Owners and reviewers consistently note the attractive color combinations and textured appearances, making it a standout feature. The watch is generally considered solidly built and good value, with satisfactory lume and smooth bezel operation. However, the bracelet and clasp are frequently criticized as underwhelming, rattly, and lacking a convenient diver's extension, a common complaint across several Seiko models. Some owners also express a desire for exhibition casebacks or note potential quality control issues such as misaligned bezels or day/date wheels. Overall, owners and reviewers rate the Seiko Prospex Sea Save the Ocean Special Edition highly for its visually striking and unique dial designs at an accessible price point.

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