The Titanium Field Guide

UNDONE Aquadeep Signal Automatic

The UNDONE Aquadeep Signal Automatic is a 43 mm Grade 2 titanium dive watch with a Seiko NH35A automatic movement.

All UNDONE watchesDiver watchesUnder $500Microbrand
Price
$395
Material
Titanium
Grade / type
Grade 2
Water resistance
500 m
Type
Diver
Case diameter
43.0 mm
Thickness
16.5 mm
Origin
Hong Kong
Movement
Automatic
Caliber
Seiko NH35A
Complications
Time only
Colour
Grey
Surface treatment
None
Finish technology
Natural finish
Nickel-free
Unconfirmed (contact-point materials not all confirmed)
Crystal
Double-domed sapphire
Display back
No
Dial
Yellow, black, or orange
Dial colours
Black Yellow Orange
Availability
Offered
Status
Current
Not published
Reference, Lug-to-lug, Weight, Power reserve, Hardness, Construction, Caseback, Bracelet / strap, Matching bracelet, Lume
High confidence Verified Oct 2026 Source: UNDONE (Aquadeep Signal Yellow) / UNDONE (Aquadeep Signal Black) / UNDONE (Aquadeep Signal Orange)
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Frequently asked questions

What grade of titanium is the UNDONE Aquadeep Signal Automatic?

Grade 2, as stated by the maker.

What size is the UNDONE Aquadeep Signal Automatic?

The case is 43 mm across and 16.5 mm thick. It is water resistant to 500 m.

How much does the UNDONE Aquadeep Signal Automatic cost, and is it available?

It is in production, at a list price of $395.

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