The Titanium Field Guide

RDUNAE R1 Zaku Tuna-II

The RDUNAE R1 Zaku Tuna-II is a current-production diver watch with a Titanium (grade undisclosed) case, finished with ip-coated titanium; aluminium shroud. It is priced well under the $1,300 median for the category.

Titanium diver watchesUnder $500Microbrand
Price
$209.9
Titanium
Titanium (grade undisclosed)
Water resistance
500 m
Type
Diver
Case diameter
52.0 mm
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Complications
Date
Case shape
Round
Case colour
Natural / grey
Finish technology
PVD / IP
Surface treatment
IP-coated titanium; aluminium shroud
Caseback
Titanium
Nickel-free
Not verified (bracelet, strap, or clasp hardware not confirmed)
Display back
No
Dial
Green, red, and blue colourways
Dial colours
Blue Green Red
Availability
Offered
Status
Current
Not published
Reference, Thickness, Lug-to-lug, Weight, Power reserve, Bracelet / strap, Titanium bracelet, Crystal, Lume Help verify
Medium confidence Verified Jul 2026 Source: RDUNAE R1 Zaku Tuna-II Maker / listing ↗
Facts are free to cite with a link.
Reader reviews & photosContribute photo or review
No reviews yet. Be the first to write one.
See it in the interactive guideGet new-watch alertsContribute a photo or review

Browse all titanium watch comparisons →

Similar titanium watches

Berny Automatic Titanium Diver WatchBernyAutomatic Titanium Diver Watch$18441.5 mm12.7 mm thick115 gDiversame category · same style · similar price · same movement
Tactical FrogTitanium FX-Diving V4$18942.0 mm13.3 mm thickDiversame category · same style · similar price · same movementThorn SHY036 39mm PT5000 TitaniumThornSHY036 39mm PT5000 Titanium$18939.0 mmDiversame category · same style · similar price · same movementAragon Divemaster Titanium NH35AragonDivemaster Titanium NH35$25050.0 mm13.6 mm thick119 gDiversame category · same style · similar price · similar sizeBerny Automatic Titanium Diver AMT159BernyAutomatic Titanium Diver AMT159$143.9941.5 mm12.5 mm thickDiversame category · same style · similar price · same movementNorth Edge TRITON-TINorth EdgeTRITON-TI$17845.0 mmDiversame category · same style · similar price · same titaniumHeimdallr Titanium SKX DiverHeimdallrTitanium SKX Diver$17942.0 mmDiversame category · same style · similar price · same movementHeimdallr Titanium TunaHeimdallrTitanium Tuna$18947.0 mmDiversame category · same style · similar price · same movement

Alternatives to the RDUNAE R1 Zaku Tuna-II

ThornT011 Titanium Vintage$18941.0 mmDiversame category · same style · shared complications · similar priceThorn 38mm Titanium 50-Fathoms DiverThorn38mm Titanium 50-Fathoms Diver$18938.0 mmDiversame category · same style · shared complications · similar priceWatchdives WD007 V4 Sea Ghost NTTD TitaniumWatchdivesWD007 V4 Sea Ghost NTTD Titanium$18942.0 mm12.2 mm thick54 gDiversame category · same style · shared complications · similar priceTandorio Thorn 42mm Retro Titanium DiverTandorioThorn 42mm Retro Titanium Diver$19941.9 mm12.9 mm thickDiversame category · same style · shared complications · similar priceWatchdives WD50Ti Titanium 50-FathomsWatchdivesWD50Ti Titanium 50-Fathoms$19940.0 mm13.25 mm thickDiversame category · same style · shared complications · similar priceWatchdives WD007 Top Hat Sapphire TitaniumWatchdivesWD007 Top Hat Sapphire Titanium$19942.0 mmDiversame category · same style · shared complications · similar price

More titanium watches from RDUNAE

RDUNAE R1 Titanium Emperor TunaRDUNAER1 Titanium Emperor Tuna$229.952.0 mmDiver

Frequently asked questions

What grade of titanium is the RDUNAE R1 Zaku Tuna-II?

The RDUNAE R1 Zaku Tuna-II has a Titanium (grade undisclosed) case with a titanium caseback. It is recorded at medium confidence pending a maker-stated grade.

What size is the RDUNAE R1 Zaku Tuna-II?

It is 52.0 mm in diameter, and water resistant to 500 m.

How much does the RDUNAE R1 Zaku Tuna-II cost, and is it available?

It is current-production and lists from $209.9.

All titanium RDUNAE watches · Titanium diver watches · All 1,163 watches

Learn: Titanium grades · Surface treatments · Why titanium scratches · How to read a spec

How we verify & grade · Image & Trademark Policy · Terms & Conditions