How much does the Seiko Prospex Sea cost?

The Seiko Prospex Sea has a manufacturer MSRP of $1,100 USD. On the secondary market it averages around —.

What movement does the Seiko Prospex Sea use?

The Seiko Prospex Sea is powered by the 6R55 automatic movement with a 72-hour power reserve.

How big is the Seiko Prospex Sea?

The case measures 41.3mm in diameter, 12.5mm thick, with a 48.2mm lug-to-lug.

What is the water resistance of the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 300m of water resistance.

What kind of crystal does the Seiko Prospex Sea have?

The Seiko Prospex Sea uses a Sapphire crystal.

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Seiko Prospex Sea

Name: Seiko Prospex Sea
Brand: Seiko
SKU: spb481j1
Price: 1100 USD
Availability: InStock

Ref. spb481j1

Diver

3 Variants

Lume:LumiBrite on hands, index(es) and bezel

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Retail MSRP

$1,100

Low

—

Avg

—

High

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Static data

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Case

41.3mm

Power Reserve

72h

Movement

Automatic

Water Resistance

300m

Crystal

Sapphire + AR

Case Dimensions

Diameter41.3mm

Thickness12.5mm

Lug-to-Lug48.2mm

Lug Width20mm

Case Build

MaterialStainless Steel

Water Resistance300m

Crystal & Dial

CrystalSapphire

AR CoatingAnti-reflective coating on inner surface

LumeLumiBrite on hands, index(es) and bezel

Movement

Caliber

6R55

TypeAutomatic

Beat Rate—

Power Reserve72 hours

Jewels24

HackingNo

Hand-WindingNo

ComplicationsTime only

Design Language

Dial styleTextured

BezelRotating (dive)

Bracelet / strapLug-attached bracelet

HandsBaton

AI-detected from product image · 5/22/2026

In a nutshell

The Seiko Prospex Sea (ref. spb481j1) is an automatic diver watch, with a 41.3mm stainless steel case, 12.5mm thick, powered by the 6R55 movement and a 72-hour power reserve. Water resistance is rated to 300m, under a sapphire crystal. Manufacturer MSRP is $1,100.

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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