Marathon Arctic OSAR 41mm AutomaticvsSeiko Prospex Sea

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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 41mm Automatic at true scale

Arctic OSAR 41mm Automatic

Seiko Prospex Sea at true scale

Prospex Sea

Diameter

41mm

41mm

Lug-to-Lug

43.5mm

lowest

46.9mm

Thickness

13mm

12.3mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

n/a

70h

MSRP

$1,800

$900

lowest

Movement

Sellita SW220-1

Seiko 6R35

Case

5 specs
Thickness
13mm
12.3mm
Lug-to-Lug
43.5mm
46.9mm
Lug Width
18mm
20mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
300m
200m

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 6R35
Power Reserve
0h
70h
Jewels
0
24

Pricing

1 specs
MSRP
$1,800
$900
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Reviews

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

Marathon Arctic OSAR 41mm Automatic

Owners widely praise the Marathon Arctic OSAR 41mm Automatic for its comfortable wearability, with one owner noting it feels lightweight and wears perfectly on a sub-7-inch wrist. The watch is designed for legibility, featuring oversized hour markers as a tool watch. Accuracy observations vary, with one owner reporting a consistent +1 second per day, while another noted -20 seconds per day. The bracelet is described as lacking refinement, with no quick-release or toolless micro-adjustment. On balance, owners and reviewers appreciate the Marathon Arctic OSAR 41mm Automatic for its tool-watch legibility and comfortable wear, though some question its value at the current price point.

Seiko Prospex Sea

Owners widely praise the Seiko Prospex Sea for its value and robust build, with many highlighting its excellent lume and attractive design. Some owners find the 41mm case size perfect, while others with smaller wrists consider it too large, thick, and heavy. The stock rubber strap is noted as uncomfortable for land wear by one owner. Overall, owners rate the Seiko Prospex Sea highly for its design and value at the price point.

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