The Titanium Field Guide

Seiko Prospex Marinemaster Tuna 1000m SBBN047

SBBN047 / S23631

The Seiko Prospex Marinemaster Tuna 1000m SBBN047 is a current-production diver watch with a titanium (super titanium) case, finished with dia-shield; ceramic shroud. At 119 g it sits around the middle for diver watches in the guide, and is priced well above the $1,299 median for the category.

All Seiko watchesWatch diver 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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Alternatives to the Seiko Prospex Marinemaster Tuna 1000m SBBN047

Tutima M2 Coastline (titanium)TutimaM2 Coastline (titanium)$3,96843.0 mm12.9 mm thickDiversame category · same style · shared complications · similar priceCitizen Promaster 1000m Professional Diver (Super Titanium)CitizenPromaster 1000m Professional Diver (Super Titanium)$2,77553.0 mm181.4 gDiversame category · same style · similar priceOris Aquis Date Titanium 43.5mmOrisAquis Date Titanium 43.5mm$2,80043.5 mm121 gDiversame category · same style · similar price
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More watches from Seiko

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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 mmOther

Frequently asked questions

What is the case material of the Seiko Prospex Marinemaster Tuna 1000m SBBN047?

The Seiko Prospex Marinemaster Tuna 1000m SBBN047 has a titanium (super titanium) case. It is recorded at medium confidence pending a maker-stated material.

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

It is 49.4 mm in diameter, 16.3 mm thick, and water resistant to 1000 m.

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

About 119 g (head).

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

It is current-production and lists from $3,500.

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