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Seiko Prospex Sea
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Seiko Monster

Diver

Owners widely praise the Seiko Prospex Sea for its excellent value, robust build, and superb lume, with many noting its comfortable wearability. Reviewers consistently highlight its impressive finishing and classic dive watch design, often comparing it favorably to older models. Some owners find the size substantial, with one noting it as big, thick, and heavy on a 6.5-inch wrist, while others find it perfect. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its exceptional value and robust, classic dive watch design.

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Monster
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Prospex Sea The Black Series
1 Variant
Lume:LumiBrite on hands, index(es) and bezel
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Buy used on eBay ↗
Retail MSRP
$550
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Alternatives
Case
42.4mm
Power Reserve
41h
Movement
Automatic
Water Resistance
200m
Crystal
Hardlex
01

Case Dimensions

Diameter42.4mm
Thickness13.4mm
Lug-to-Lug49.4mm
Lug Width20mm
02

Case Build

MaterialStainless Steel
Water Resistance200m
03

Crystal & Dial

CrystalHardlex
LumeLumiBrite on hands, index(es) and bezel
04

Movement

Caliber
Seiko 4R36
TypeAutomatic
Beat Rate—
Power Reserve41 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05

Design Language

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

The Seiko Monster is an automatic diver watch, with a 42.4mm stainless steel case, 13.4mm thick, powered by the Seiko 4R36 movement and a 41-hour power reserve. Water resistance is rated to 200m, under a hardlex crystal. Manufacturer MSRP is $550.

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