The Wristwatch Field Guide

Seiko Prospex LX Line SNR031

SNR031 / SBDB021

The Seiko Prospex LX Line SNR031 is a current-production diver watch with a black titanium (super titanium) case, finished with dlc coating. It measures 44.8 mm across, 14.7 mm thick, 110 g, and is water resistant to 300 m. Inside is the Seiko 5R65 spring drive movement, with 72 h power reserve. Complications: Power reserve. Priced from $6,500 (approx). Brand origin: Japan.

Titanium and ceramic diver watchesTitaniumBlackDivers
Reference
SNR031 / SBDB021
Type
Diver
Price
$6,500 · approx
Case diameter
44.8 mm
Thickness
14.7 mm
Lug-to-lug
–
Water resistance
300 m
Weight
110 g (head only)
Origin
Japan
Movement
Spring Drive
Caliber
Seiko 5R65
Power reserve
72 h
Complications
Power reserve
Material
Titanium
Grade / type
Titanium (Super Titanium)
Colour
Black
Hardness
–
Construction
–
Surface treatment
DLC coating
Caseback
–
Nickel-free
Not verified (contact-point materials not all confirmed)
Bracelet / strap
Silicone strap
Matching bracelet
–
Crystal
Sapphire
Display back
No
Dial
Black
Lume
LumiBrite
Availability
Offered
Status
Current
Medium confidence Verified Jun 2026 Source: aBlogtoWatch Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

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TAG HeuerAquaracer Professional 300 Date Titanium (green)$4,95043.0 mmDiversame category · same style · similar price · similar sizeRalf Tech WRX Electric Space Millenium x CNESRalf TechWRX Electric Space Millenium x CNES$5,00047.5 mm95 gDiversame category · same style · similar price · similar sizeTudor Pelagos FXDTudorPelagos FXD$5,02542.0 mm12.75 mm thick82 gDiversame category · same style · similar price · similar size
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More titanium and ceramic watches from Seiko

SeikoProspex Shogun Titanium (SPB191)$1,20043.5 mm13.3 mm thick99 gDiver
SeikoProspex "Cave Diver" Shogun Titanium (SPB349)$1,50043.5 mmDiver
SeikoProspex "Cave Diver" Shogun Titanium (SPB351)$1,50043.5 mmDiver
SeikoProspex "Cave Diver" Shogun Titanium (SPB357)$1,50043.0 mmDiver
SeikoProspex Marinemaster Professional 600m Titanium (SBDX067)$4,60045.4 mmDiver
SeikoProspex LX Line Spring Drive GMT Titanium (SNR035)$5,25044.8 mmOther

Frequently asked questions

What is the case material of the Seiko Prospex LX Line SNR031?

The Seiko Prospex LX Line SNR031 has a black titanium (super titanium) case. It is recorded at medium confidence pending a maker-stated material.

What size is the Seiko Prospex LX Line SNR031?

It is 44.8 mm in diameter, 14.7 mm thick, and water resistant to 300 m.

How much does the Seiko Prospex LX Line SNR031 weigh?

About 110 g (head).

How much does the Seiko Prospex LX Line SNR031 cost, and is it available?

It is current-production and lists from $6,500.

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