The Titanium Field Guide

Seiko Prospex Shogun Titanium (SPB191)

The Seiko Prospex Shogun Titanium (SPB191) is a current-production diver watch with a titanium (grade undisclosed) case, finished with super-hard coating. At 99 g it sits around the middle for diver watches in the guide, and is priced close to the $1,299 median for the category. It ships on a matching titanium bracelet rather than a strap.

All Seiko watchesWatch diver watchesUnder $3,000Lightest, rankedOn a titanium bracelet
Price
$1,200
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Weight
99 g (head only)
Water resistance
200 m
Type
Diver
Case diameter
43.5 mm
Thickness
13.3 mm
Origin
Japan
Movement
Automatic
Caliber
Seiko 6R35
Power reserve
70 h
Complications
Date
Colour
Grey
Surface treatment
Super-hard coating
Finish technology
Surface hardening
Nickel-free
Unconfirmed (contact-point materials not all confirmed)
Bracelet / strap
Titanium bracelet
Matching bracelet
Standard
Crystal
Sapphire, AR coated
Display back
No
Dial
White (SPB191); black (SPB189)
Dial colours
Black White
Lume
LumiBrite
Availability
Offered
Status
Current
Not published
Reference, Lug-to-lug, Hardness, Construction, Caseback
High confidence Verified Aug 2026 Source: Monochrome Maker ↗ Spec checksGrade Jul 2026Price Aug 2026 mediumWeight Jul 2026
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Alternatives to the Seiko Prospex Shogun Titanium (SPB191)

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SeikoProspex "Cave Diver" Shogun Titanium (SPB357)$1,50043.0 mmDiverSeiko Prospex Marinemaster Professional 600m Titanium (SBDX067)SeikoProspex Marinemaster Professional 600m Titanium (SBDX067)$4,60045.4 mmDiverSeiko Prospex LX Line Spring Drive GMT Titanium (SNR035)SeikoProspex LX Line Spring Drive GMT Titanium (SNR035)$5,25044.8 mmOtherSeiko Prospex Marinemaster Professional 600m Titanium (SLA081, 60th Anniversary)SeikoProspex Marinemaster Professional 600m Titanium (SLA081, 60th Anniversary)$4,60045.4 mm16 mm thick174 gDiver

Frequently asked questions

What is the case material of the Seiko Prospex Shogun Titanium (SPB191)?

The Seiko Prospex Shogun Titanium (SPB191) has a titanium (grade undisclosed) case. This is confirmed against the maker spec.

What size is the Seiko Prospex Shogun Titanium (SPB191)?

It is 43.5 mm in diameter, 13.3 mm thick, and water resistant to 200 m.

How much does the Seiko Prospex Shogun Titanium (SPB191) weigh?

About 99 g (head).

How much does the Seiko Prospex Shogun Titanium (SPB191) cost, and is it available?

It is current-production and lists from $1,200.

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