The Titanium Field Guide

Citizen Attesa Tsuki-Yomi A-T (Super Titanium)

BY1010-57H

The Citizen Attesa Tsuki-Yomi A-T (Super Titanium) is a current-production watch with a Super Titanium (proprietary) case, finished with duratect surface hardening. At 105 g it sits around the middle for watches in the guide, and is priced well under the $1,900 median across the guide. It ships on a matching titanium bracelet rather than a strap.

Titanium other watchesUnder $1,000Lightest, rankedOn a titanium braceletSolarWorldtimerPerpetual calendar
Price
$875
Titanium
Super Titanium (proprietary)
Weight
105 g (with bracelet)
Water resistance
100 m
Reference
BY1010-57H
Type
Other
Case diameter
43.0 mm
Origin
Japan
Movement
Eco-Drive radio-controlled, moonphase, world time
Caliber
Citizen H874
Complications
Day-date, Perpetual calendar, Worldtimer
Case shape
Round
Case colour
Natural / grey
Finish technology
Surface hardening
Surface treatment
Duratect surface hardening
Caseback
Titanium
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Super Titanium bracelet
Titanium bracelet
Standard
Crystal
Sapphire
Display back
No
Dial
Grey (silver-tone accents)
Dial colours
Silver Grey
Availability
Offered
Status
Current
Not published
Thickness, Lug-to-lug, Power reserve, Lume Help verify
High confidence Verified Jul 2026 Source: Citizen (maker) Maker / listing ↗
Facts are free to cite with a link.
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Frequently asked questions

What grade of titanium is the Citizen Attesa Tsuki-Yomi A-T (Super Titanium)?

The Citizen Attesa Tsuki-Yomi A-T (Super Titanium) has a Super Titanium (proprietary) case with a titanium caseback. This is confirmed against the maker spec.

What size is the Citizen Attesa Tsuki-Yomi A-T (Super Titanium)?

It is 43.0 mm in diameter, and water resistant to 100 m.

How much does the Citizen Attesa Tsuki-Yomi A-T (Super Titanium) weigh?

About 105 g (w/ bracelet).

How much does the Citizen Attesa Tsuki-Yomi A-T (Super Titanium) cost, and is it available?

It is current-production and lists from $875.

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