The Wristwatch Field Guide

Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042

SLA042 / SBDX038

The Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042 is a current-production diver watch with a titanium (grade undisclosed) case, finished with ceramic outer shroud. It is priced well above the $1,195 median for the category.

Exotic-material diver watchesTitaniumDiversUnder $5,000
Price
$3,200
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Water resistance
1000 m
Reference
SLA042 / SBDX038
Type
Diver
Case diameter
52.4 mm
Origin
Japan
Movement
Automatic
Caliber
8L35
Power reserve
50h
Complications
Date
Colour
Grey
Surface treatment
Ceramic outer shroud
Caseback
Titanium
Nickel-free
Not verified (bracelet, strap, or clasp hardware not confirmed)
Bracelet / strap
Black silicone strap
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
LumiBrite
Availability
Offered
Status
Current
Not published
Thickness, Lug-to-lug, Weight, Hardness, Construction, Matching bracelet
Medium confidence Verified Jul 2026 Source: Seiko (Prospex SLA042) Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

Similar exotic-material watches

Massena LABUNIMATIC x Massena LAB Modello Quattro Meteorite (titanium)$2,99540.0 mmDiversame category · same style · similar price · same movementMühle-Glashütte S.A.R. Mission-Timer TITANMühle-GlashütteS.A.R. Mission-Timer TITAN$3,10043.0 mm13 mm thickDiversame category · same style · similar price · same movementHamilton Khaki Navy BeLOWZERO Auto Titanium (grey)HamiltonKhaki Navy BeLOWZERO Auto Titanium (grey)$1,99546.0 mm15.7 mm thick129 gDiversame category · same style · similar price · same movementHamilton Khaki Navy BeLOWZERO Auto Titanium (black)HamiltonKhaki Navy BeLOWZERO Auto Titanium (black)$1,99546.0 mm15.7 mm thick129 gDiversame category · same style · similar price · same movementYema Skin Diver Slim Bronze CMM.20YemaSkin Diver Slim Bronze CMM.20$2,44939.0 mm10 mm thickDiversame category · same style · similar price · same movement
OrisDivers Sixty-Five Cotton Candy (Full Bronze)$2,60038.0 mmDiversame category · same style · similar price · same movementEterna KonTiki Bronze ManufactureEternaKonTiki Bronze Manufacture$2,65044.0 mm14.05 mm thickDiversame category · same style · similar price · same movement
Maurice LacroixPontos S Diver Bronze$2,70042.0 mmDiversame category · same style · similar price · same movement

Alternatives to the Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042

Oris Aquis Pro 1000mOrisAquis Pro 1000m$3,80049.5 mm16.6 mm thickDiversame category · same style · shared complications · similar price
CitizenPromaster 1000m Professional Diver (Super Titanium)$2,77553.0 mm181.4 gDiversame category · same style · shared complications · similar priceNomadic Brú 750NomadicBrú 750$2,49542.0 mm13.5 mm thickDiversame category · same style · shared complications · similar price
STILMegara Limited Edition (Titanium)$2,68042.0 mm13.4 mm thickDiversame category · same style · shared complications · similar price
OrisAquis Date Titanium 43.5mm$2,80043.5 mm121 gDiversame category · same style · shared complications · similar price
RadoCaptain Cook High-Tech Ceramic 43mm$2,80043.0 mmDiversame category · same style · shared complications · similar price

More exotic-material watches from Seiko

Seiko Prospex Shogun Titanium (SPB191)SeikoProspex Shogun Titanium (SPB191)$1,20043.5 mm13.3 mm thick99 gDiver
SeikoProspex "Cave Diver" Shogun Titanium (SPB349)$1,50043.5 mmDiverSeiko Prospex SeikoProspex "Cave Diver" Shogun Titanium (SPB351)$1,50043.5 mmDiver
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 Professional 1000m Emperor Tuna SLA042?

The Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042 has a titanium (grade undisclosed) case with a titanium caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042?

It is 52.4 mm in diameter, and water resistant to 1000 m.

How much does the Seiko Prospex Marinemaster Professional 1000m Emperor Tuna SLA042 cost, and is it available?

It is current-production and lists from $3,200.

All exotic-material Seiko watches · Exotic-material diver watches · All 1,792 watches

Learn: Which Material? · Lightest Materials · Most Scratch-Resistant · Materials and Skin