The Wristwatch Field Guide

Seiko Prospex "Cave Diver" Shogun Titanium (SPB351)

The Seiko Prospex "Cave Diver" Shogun Titanium (SPB351) is a current-production diver watch with a grey titanium (super-hard coating) case, finished with super-hard coating. It measures 43.5 mm across, and is water resistant to 200 m. Inside is the 6R35 automatic movement, with 70 h power reserve. Complications: Date. Priced from $1,500 (US Special Edition). Brand origin: Japan.

Titanium and ceramic diver watchesTitaniumDiversUnder $5,000
Reference
Type
Diver
Price
$1,500 · US Special Edition
Case diameter
43.5 mm
Thickness
Lug-to-lug
Water resistance
200 m
Weight
Origin
Japan
Movement
Automatic
Caliber
6R35
Power reserve
70 h
Complications
Date
Material
Titanium
Grade / type
Titanium (super-hard coating)
Colour
Grey
Hardness
Construction
Surface treatment
Super-hard coating
Caseback
Titanium
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Titanium bracelet
Matching bracelet
Standard
Crystal
Sapphire
Display back
No
Dial
Light blue-gray (textured)
Lume
LumiBrite
Availability
Offered
Status
Current
Medium confidence Verified Jul 2026 Source: Seiko Luxe / AZ Fine Time Maker / listing ↗
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Frequently asked questions

What is the case material of the Seiko Prospex "Cave Diver" Shogun Titanium (SPB351)?

The Seiko Prospex "Cave Diver" Shogun Titanium (SPB351) has a grey titanium (super-hard coating) case with a titanium caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Seiko Prospex "Cave Diver" Shogun Titanium (SPB351)?

It is 43.5 mm in diameter, and water resistant to 200 m.

How much does the Seiko Prospex "Cave Diver" Shogun Titanium (SPB351) cost, and is it available?

It is current-production and lists from $1,500.

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