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Seiko Prospex Sea
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Seiko Prospex Sea

Diver

Seiko Prospex Sea owners and reviewers praise its Marinemaster-style aesthetic, excellent case finishing, and impressive LumiBrite lume. The watch is powered by the 6R15 movement with a 50-hour power reserve and comes with both a steel bracelet and a silicone strap. Some owners find the Seiko Prospex Sea to be a great value and a suitable first "proper" watch, while others report it is uncomfortably big, thick, and heavy on smaller wrists. Reviewers note the GMT function is secondary with a less prominent scale, and the bezel's quieter clicks may not appeal to all. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its classic design and finishing at its price point.

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4 Variants
Lume:LumiBrite on hands and index(es)
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Retail MSRP
$1,500
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Alternatives
Case
43.5mm
Power Reserve
70h
Movement
Automatic
Water Resistance
200m
Crystal
Sapphire + AR
01

Case Dimensions

Diameter43.5mm
Thickness13.3mm
Lug-to-Lug51mm
Lug Width22mm
02

Case Build

MaterialTitanium
Water Resistance200m
03

Crystal & Dial

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

Movement

Caliber
6R35
TypeAutomatic
Beat Rate—
Power Reserve70 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05

Design Language

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