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Seiko Prospex Sea
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Seiko Prospex Sea

Diver

Owners widely praise the Seiko Prospex Sea for its excellent value, solid build, and comfortable wearability, with specific mentions of its matte black dial, excellent lume, and cushion case that wears smaller than its dimensions suggest. The 4R36 movement is noted for hacking and hand-winding capabilities, and the bezel action is described as smooth and precise. Some owners find the watch to be a legitimate tool with a fair price, while others describe it as big, thick, and heavy, uncomfortable for smaller wrists, though this is subjective as one owner found the size perfect. The solar quartz movement is also highlighted as a collection-worthy feature. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its exceptional value and comfortable, classic design.

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Prospex Sea The Black Series
2 Variants
Lume:LumiBrite on hands, index(es) and bezel
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Alternatives
Case
42mm
Power Reserve
72h
Movement
Automatic
Water Resistance
300m
Crystal
Sapphire + AR
01

Case Dimensions

Diameter42mm
Thickness13.3mm
Lug-to-Lug48.6mm
Lug Width20mm
02

Case Build

MaterialStainless Steel
Water Resistance300m
03

Crystal & Dial

CrystalSapphire
AR CoatingAnti-reflective coating on inner surface
LumeLumiBrite on hands, index(es) and bezel
04

Movement

Caliber
6R54
TypeAutomatic
Beat Rate—
Power Reserve72 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05

Design Language

Dial styleMatte
BezelRotating (dive)
Bracelet / strapLug-attached bracelet
HandsBaton
AI-detected from product image · 5/22/2026
In a nutshell

The Seiko Prospex Sea is an automatic diver watch, with a 42mm stainless steel case, 13.3mm thick, powered by the 6R54 movement and a 72-hour power reserve. Water resistance is rated to 300m, under a sapphire crystal.

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