The Wristwatch Field Guide

RDUNAE R1 Zaku Tuna-II

The RDUNAE R1 Zaku Tuna-II is a current-production diver watch with a grey titanium (grade undisclosed) case, finished with ip-coated titanium; aluminium shroud. It measures 52.0 mm across, and is water resistant to 500 m. Inside is the Seiko NH35 automatic movement. Complications: Date. Priced from $209.9. Brand origin: China.

Titanium and ceramic diver watchesTitaniumDiversUnder $5,000
Reference
–
Type
Diver
Price
$209.9
Case diameter
52.0 mm
Thickness
–
Lug-to-lug
–
Water resistance
500 m
Weight
–
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Power reserve
–
Complications
Date
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Colour
Grey
Hardness
–
Construction
–
Surface treatment
IP-coated titanium; aluminium shroud
Caseback
Titanium
Nickel-free
Not verified (bracelet, strap, or clasp hardware not confirmed)
Bracelet / strap
–
Matching bracelet
–
Crystal
–
Display back
No
Dial
–
Lume
–
Availability
Offered
Status
Current
Medium confidence Verified Jul 2026 Source: RDUNAE R1 Zaku Tuna-II Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

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More titanium and ceramic watches from RDUNAE

RDUNAER1 Titanium Emperor Tuna$229.952.0 mmDiver

Frequently asked questions

What is the case material of the RDUNAE R1 Zaku Tuna-II?

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

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.

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