Side by side

Seiko Prospex SeavsStudio Underd0g Full Moon

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Prospex Sea
SeikoProspex Sea
MSRP $1,100
Full Moon
Studio Underd0gFull Moon
MSRP $800

At a glance

14 of 29 specs differ
Diameter
Prospex Sea41.3mm
Full Moon39.5mm
Power Reserve
Prospex Sea72h
Full Moon40h
Water Resistance
Prospex Sea300m
Full Moon
MSRP
Prospex Sea$1,100
Full Moon$800

Full specifications

Case

6 specs
Category
Diver
Casual
Diameter
41.3mm
39.5mm
Thickness
12.5mm
Lug-to-Lug
48.2mm
Lug Width
20mm
Water Resistance
300m

Crystal & Dial

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

Movement

4 specs
Caliber
6R55
Type
Automatic
Manual
Power Reserve
72h
40h
Jewels
24
25

Pricing

1 specs
MSRP
$1,100
$800

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What people say

Owners + reviewers, side by side

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

Seiko Prospex Sea

Seiko Prospex Sea models are widely praised for their excellent build quality, value for money, and comfortable wearability, with many appreciating the vintage-inspired designs and robust construction. Owners note the silicone straps are surprisingly comfortable and well-finished, and the Lumibrite lume is excellent. However, some find the 44.3mm size and thickness too large for smaller wrists, though others report the sizing as perfect. The 6R15 movement in some variants offers accuracy around +4 seconds per day with a 50-hour power reserve, while newer movements offer more. Some models are criticized for a bracelet width not matching the case size or a rudimentary clasp for their price point. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its impressive case work and finishing at its price point.

Studio Underd0g Full Moon

Owners widely praise the Studio Underd0g Full Moon's harmonious creamy dial and its 37mm case, which fits flawlessly. The innovative sapphire disc with numerals is a highlight, though two visible screws holding it are noted as a minor aesthetic drawback. Some owners find the watch overpriced, while others see value in the upgraded Sellita movement under $1k. Lume is surprisingly good, and the included NATO strap is preferred by some over the leather. Accuracy ranges from +1/+2 seconds per day to about -6 seconds per day. On balance, owners rate the Studio Underd0g Full Moon highly for its versatile dial and well-fitting case at the price point.

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