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Seiko Prospex "Cave Diver" Shogun Titanium (SPB357)

Archive · used only

The SPB357 is a US-only special edition of the Shogun, Seiko's titanium diver, with a textured blue dial meant to evoke the light in an underwater cave. It keeps the Shogun formula: a 43 mm titanium case and bracelet under a super-hard coating that fights the scuffs bare titanium picks up, 200 m of water resistance and a sapphire crystal. Inside is the 6R35 automatic with 70 hours of reserve and a date. It listed at $1,500 through Seiko's US dealers, and by October 2026 Seiko had dropped the Cave Diver Shogun series from its own site, so a used example is now the only route to one.

Written 28 September 2026 from Exquisite Timepieces' listing.

All Seiko watchesDiver watchesUnder $3,000On a titanium bracelet
Price
$1,500
Material
Titanium
Grade / type
Titanium (super-hard coating)
Water resistance
200 m
Type
Diver
Case diameter
43.0 mm
Origin
Japan
Movement
Automatic
Caliber
6R35
Power reserve
70 h
Complications
Date
Colour
Grey
Surface treatment
Super-hard coating
Finish technology
Surface hardening
Caseback
Titanium
Nickel-free
Unconfirmed (clasp or buckle material not confirmed)
Bracelet / strap
Titanium bracelet
Matching bracelet
Standard
Crystal
Sapphire
Display back
No
Dial
Blue
Dial colours
Blue
Lume
LumiBrite
Availability
No longer offered
Status
Archive (retired; the maker no longer lists the Cave Diver Shogun series, per an owner check on 2026-10-17)
Not published
Reference, Thickness, Lug-to-lug, Weight, Hardness, Construction
Medium confidence Verified Oct 2026 Source: Seiko (SPB357, us-en) / Seiko Luxe / Exquisite Timepieces
Facts are free to cite with a link.
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Frequently asked questions

What grade of titanium is the Seiko Prospex "Cave Diver" Shogun Titanium (SPB357)?

Titanium, with no grade stated. The caseback is titanium too. The record is at medium confidence, so check the maker's page before relying on it.

What size is the Seiko Prospex "Cave Diver" Shogun Titanium (SPB357)?

The case is 43 mm across. It is water resistant to 200 m.

How much does the Seiko Prospex "Cave Diver" Shogun Titanium (SPB357) cost, and is it available?

It is no longer made, so the only way to buy one is used. Its list price when it was in production was $1,500.

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