
Tsuki-yomi A-T
Ref.: BY1010-57H
The Citizen Tsuki-yomi A-T isn’t just another titanium watch, it’s got a lunar-inspired dial (also available in multiple different colors), atomic timekeeping, and world time across 24 zones, so you’re always ahead of the game. The 43mm Super Titanium case is featherlight but tough, and thanks to Eco-Drive tech, it never needs a battery. The moon phase display is a subtle flex, tying the whole design together. Whether you’re traveling or just watching the night sky, this one’s got style and brains.









Case Details
All the info on the case construction, dimensions, shape, and finishing.
- Case Diameter
- 43mm
- Lug-to-Lug Distance
- 48mm
- Lug Width
- 22mm
- Case Thickness
- 10.9mm
- Caseback Style
- Closed Back
- Lugs Drilled?
- No
- Case Shape
- Round
- Case Material
- Titanium
- Case Finishing
- Brushed
- Water Resistance
- 10 ATM
Movement Details
Technical specs and extras under the hood.
- Movement Type
- Solar
- Movement Name
- Citizen Eco-Drive H874
- Hacking Seconds?
- Yes
- Complications & Features
- Atomic Timekeeping, Date, Day, Moonphase, Perpetual Calendar, Radio Control, World Timer
Dial Details
Color, material, lume, and other dial features.
- Dial Color
- Grey / Anthracite
- Dial Characteristic
- Textured
Crystal Details
Crystal material, type, and coatings.
- Crystal Material
- Sapphire Crystal
Crown Details
Crown type and any additional crown functions.
- Crown Type
- Push-Pull
General Details
Brand, origin, price range, and more.
- Brand
- Citizen
- Country of Origin
- Japan
- Watch Type
- Adventure Sports
- Price Range (USD)
- $