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 other watch with a Super Titanium (proprietary) case, finished with duratect surface hardening. It measures 43.0 mm across, and is water resistant to 100 m. Inside is the Citizen H874 eco-drive radio-controlled, moonphase, world time movement. Complications: Day-date, Perpetual calendar, Worldtimer. Priced from $875. Brand origin: Japan.

Titanium other watchesUnder $1,000
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ReferenceBY1010-57H
TypeOther
Price$875
Case diameter43.0 mm
Thickness–
Lug-to-lug–
Water resistance100 m
Weight–
OriginJapan
MovementEco-Drive radio-controlled, moonphase, world time
CaliberCitizen H874
Power reserve–
ComplicationsDay-date, Perpetual calendar, Worldtimer
TitaniumSuper Titanium (proprietary)
Surface treatmentDuratect surface hardening
Nickel-freeYes
Bracelet / strapSuper Titanium bracelet
CrystalSapphire
Display backNo
DialMoonphase display
Lume–
AvailabilityOffered
StatusCurrent
High confidence Verified 2026-06-21 Source: Citizen (maker) Maker / listing ↗
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