Addiesdive Marinemaster 300vsSeiko 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.

Addiesdive Marinemaster 300 at true scale

Marinemaster 300

Seiko Prospex Sea Save the Ocean Special Edition at true scale

Prospex Sea Save the Ocean Special Edition

Diameter

44mm

45mm

Lug-to-Lug

n/a

47.7mm

Thickness

17mm

13.2mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

n/a

41h

MSRP

$139

lowest

$625

Movement

Seiko NH35

Seiko 4R36

Case

5 specs
Diameter
44mm
45mm
Thickness
17mm
13.2mm
Lug-to-Lug
n/a
47.7mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko NH35
Seiko 4R36
Power Reserve
0h
41h
Jewels
0
24

Pricing

1 specs
MSRP
$139
$625
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Reviews

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

Addiesdive Marinemaster 300

Owners widely praise the Addiesdive Marinemaster 300 Luxury Men's Automatic for its excellent value, good dial and lume quality, and the reliable Seiko NH35 movement. Some owners report the watch holds about 12 hours of charge, requiring manual winding, with one owner noting their NH35 movement stopped while at rest. Skepticism exists regarding the advertised water resistance for actual diving and the reliability of the warranty service, which requires shipping to China. Overall, owners rate the Addiesdive Marinemaster 300 Luxury Men's Automatic highly for its impressive lume and value at the price point.

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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