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Home/Browse/Seiko/King Turtle
Seiko Prospex Sea
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Seiko King Turtle

Diver

Owners widely praise the Seiko Prospex Sea for its excellent value, robust build, and superior lume, with many appreciating its faithful recreation of classic designs and proven movements like the 4R36 and 6R15. Reviewers highlight impressive case finishing and durability, noting that even larger models wear smaller than expected due to thoughtful case design. Some owners find the solar quartz models a great entry point, appreciating their design and solar functionality. However, specific variants receive critiques: the bracelet clasp on the Samurai is described as underwhelming, and the Sumo's bracelet width and clasp are seen as too narrow and rudimentary, respectively. The SPB183 is considered expensive for a Japanese watch, and its lume is noted as not quite matching older Seiko Monster models. The GMT function on the SPB519 is deemed less practical for serious travel, and its bezel clicks are described as quieter and mushier.

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Prospex Sea The Black Series
4 Variants· 45mm
Lume:LumiBrite on hands and index(es)
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Buy used on eBay ↗
Retail MSRP
$650
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Alternatives
Case
45mm
Power Reserve
41h
Movement
Automatic
Water Resistance
200m
Crystal
Sapphire + AR
01

Case Dimensions

Diameter
Thickness13.2mm
Lug-to-Lug47.7mm
Lug Width22mm
02

Case Build

MaterialStainless Steel
Water Resistance200m
03

Crystal & Dial

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

Movement

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

Design Language

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

The Seiko King Turtle is an automatic diver watch, with a 45mm stainless steel case, 13.2mm thick, powered by the Seiko 4R36 movement and a 41-hour power reserve. Water resistance is rated to 200m, under a sapphire crystal. Manufacturer MSRP is $650.

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