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 $1,299 median for the category.

All RDUNAE watchesWatch diver watchesUnder $500Microbrand
Price
$209.9
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Water resistance
500 m
Type
Diver
Case diameter
52.0 mm
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Complications
Date
Colour
Grey
Surface treatment
IP-coated titanium; aluminium shroud
Finish technology
PVD / IP
Caseback
Titanium
Nickel-free
Unconfirmed (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, Hardness, Construction, Bracelet / strap, Matching bracelet, Crystal, Lume
Medium confidence Verified Sep 2026 Source: RDUNAE R1 Zaku Tuna-II Spec checksGrade Jul 2026Price Sep 2026
Facts are free to cite with a link.
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Frequently asked questions

What is the case material of 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 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 $209.90.

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