How much does the Seiko Prospex Sea cost?

The Seiko Prospex Sea has a manufacturer MSRP of $1,500 USD. On the secondary market it averages around —.

What movement does the Seiko Prospex Sea use?

The Seiko Prospex Sea is powered by the 6R35 automatic movement with a 70-hour power reserve.

How big is the Seiko Prospex Sea?

The case measures 43.5mm in diameter, 13.3mm thick, with a 51mm lug-to-lug.

What is the water resistance of the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 200m 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: spb349j1
Price: 1500 USD
Availability: InStock

Ref. spb349j1

Diver

4 Variants

Lume:LumiBrite on hands and index(es)

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Retail MSRP

$1,500

Low

—

Avg

—

High

—

Static data

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Case

43.5mm

Power Reserve

70h

Movement

Automatic

Water Resistance

200m

Crystal

Sapphire + AR

Case Dimensions

Diameter43.5mm

Thickness13.3mm

Lug-to-Lug51mm

Lug Width22mm

Case Build

MaterialTitanium

Water Resistance200m

Crystal & Dial

CrystalSapphire

AR CoatingAnti-reflective coating on inner surface

LumeLumiBrite on hands and index(es)

Movement

Caliber

6R35

TypeAutomatic

Beat Rate—

Power Reserve70 hours

Jewels24

HackingNo

Hand-WindingNo

ComplicationsTime only

Design Language

Dial styleTextured

BezelRotating (dive)

Bracelet / strapLug-attached bracelet

HandsDauphine

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

In a nutshell

The Seiko Prospex Sea (ref. spb349j1) is an automatic diver watch, with a 43.5mm titanium case, 13.3mm thick, powered by the 6R35 movement and a 70-hour power reserve. Water resistance is rated to 200m, under a sapphire crystal. Manufacturer MSRP is $1,500.

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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