The Titanium Field GuidePicks of the month

Seiko Prospex Marinemaster Tuna 1000m SBBN047

SBBN047 / S23631

The Seiko Prospex Marinemaster Tuna 1000m SBBN047 is a 49.4 mm Super Titanium dive watch with a Seiko 7C46 quartz movement. At 49.4 mm across, it is larger than 95% of the 359 titanium dive watches in the guide. The case is surface-hardened, which guards against the scuffs bare titanium picks up.

All Seiko watchesDiver watchesLightest, ranked
Price
$3,500
Material
Titanium
Grade / type
Titanium (Super Titanium)
Weight
119 g (head only)
Water resistance
1000 m
Reference
SBBN047 / S23631
Type
Diver
Case diameter
49.4 mm
Thickness
16.3 mm
Origin
Japan
Movement
Quartz
Caliber
Seiko 7C46
Power reserve
5 years
Complications
Day-date
Colour
Grey
Surface treatment
Dia-Shield; ceramic shroud
Finish technology
Surface hardening
Nickel-free
Unconfirmed (contact-point materials not all confirmed)
Bracelet / strap
Silicone strap
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
LumiBrite
Availability
Offered
Status
Current (JDM); maker titanium token pending re-verification
Not published
Lug-to-lug, Hardness, Construction, Caseback, Matching bracelet
Medium confidence Verified Sep 2026 Source: Gnomon Watches Maker ↗ Spec checksGrade Sep 2026Price Jun 2026Weight Jun 2026
Facts are free to cite with a link.
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Frequently asked questions

What grade of titanium is the Seiko Prospex Marinemaster Tuna 1000m SBBN047?

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

What size is the Seiko Prospex Marinemaster Tuna 1000m SBBN047?

The case is 49.4 mm across and 16.3 mm thick. It is water resistant to 1,000 m.

How much does the Seiko Prospex Marinemaster Tuna 1000m SBBN047 weigh?

About 119 g for the watch head alone.

How much does the Seiko Prospex Marinemaster Tuna 1000m SBBN047 cost, and is it available?

It is in production, at a list price of $3,500.

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