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Seiko Prospex Sea
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Seiko Prospex Sea

Diver

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.

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Prospex Sea The Black Series
3 Variants
Lume:LumiBrite on hands, index(es) and bezel
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Retail MSRP
$1,100
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Alternatives
Case
41.3mm
Power Reserve
72h
Movement
Automatic
Water Resistance
300m
Crystal
Sapphire + AR
01

Case Dimensions

Diameter41.3mm
Thickness12.5mm
Lug-to-Lug48.2mm
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
6R55
TypeAutomatic
Beat Rate—
Power Reserve72 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05

Design Language

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