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. It measures 49.4 mm across, 16.3 mm thick, and is water resistant to 1000 m. Inside is the Seiko 7C46 quartz movement, with 5 years power reserve. Complications: Day-date. Priced from $3,500 (approx; JDM; maker token pending). Brand origin: Japan.

Titanium diver watches
ReferenceSBBN047 / S23631
TypeDiver
Price$3,500 · approx; JDM; maker token pending
Case diameter49.4 mm
Thickness16.3 mm
Lug-to-lug–
Water resistance1000 m
Weight–
OriginJapan
MovementQuartz
CaliberSeiko 7C46
Power reserve5 years
ComplicationsDay-date
TitaniumTitanium (Super Titanium)
Surface treatmentDia-Shield; ceramic shroud
Nickel-freeYes
Bracelet / strapSilicone strap
CrystalSapphire
Display backNo
DialBlack
LumeLumiBrite
AvailabilityOffered
StatusCurrent (JDM); maker titanium token pending re-verification
Medium confidence Verified 2026-06-22 Source: Gnomon Watches Maker / listing ↗
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