Citizen Tsuki-yomi A-T BY1010-57H – Super Titanium Eco-Drive Atomic Moonphase Watch
The Citizen Tsuki-yomi A-T BY1010-57H is a sophisticated Eco-Drive atomic timekeeping watch that combines advanced Citizen technology with a refined sport-luxury design. Featuring a gray dial, silver-tone Super Titanium™ case and bracelet, and a distinctive moonphase display, this model offers everyday comfort, durability, and high functionality in a modern 43mm profile.
Powered by Citizen’s light-powered Eco-Drive technology, the BY1010-57H runs on any light source and eliminates the need for regular battery replacement. With Atomic Timekeeping, Radio Control, World Time in 24 time zones, a Perpetual Calendar, and Day-Date functionality, this watch is built for those who appreciate precision, convenience, and innovative Japanese watchmaking.
Design Overview
The 43mm silver-tone Super Titanium™ case gives the Tsuki-yomi A-T a strong yet lightweight presence on the wrist. The gray dial is inspired by the surface of the moon, with a moonphase window positioned at 6 o’clock for a refined and technical look. Its matching Super Titanium™ bracelet provides durability and comfort, while the sapphire crystal offers superior scratch resistance and hardness for long-term wear.
With WR100 / 10 Bar / 333 ft water resistance, this model is suitable for swimming, showering, and snorkeling, making it a practical choice for daily wear as well as travel.
Key Features
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Citizen Tsuki-yomi A-T Collection – Moonphase design with advanced timekeeping technology
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Eco-Drive Movement Caliber H874 – Powered by any light source
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Atomic Timekeeping / Radio Control – Designed for highly accurate timekeeping
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Moonphase Display – Displays the current phase of the moon
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World Time in 24 Time Zones – Ideal for travel and international use
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Perpetual Calendar – Automatically adjusts for date changes
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Day-Date Display – Practical everyday functionality
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Super Titanium™ Case and Bracelet – Lightweight, durable, and comfortable
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Sapphire Crystal – Superior scratch resistance and hardness
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WR100 / 10 Bar / 333 ft Water Resistance – Suitable for swimming, showering, and snorkeling
Case & Exterior
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Model: BY1010-57H
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Collection: Citizen Tsuki-yomi A-T
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Case Material: Silver-Tone Super Titanium™
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Case Diameter: 43 mm
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Lug Width: 22 mm
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Dial Color: Gray
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Crystal: Sapphire Crystal
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Band: Super Titanium™ Bracelet
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Clasp: Fold Over Clasp with Push Buttons
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Weight: 105 g
Movement & Performance
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Movement: Citizen Caliber H874
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Technology: Eco-Drive, powered by any light source
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Timekeeping: Atomic Timekeeping / Radio Control
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Functions: Moonphase, World Time in 24 Time Zones, Perpetual Calendar, Day-Date
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Water Resistance: WR100 / 10 Bar / 333 ft
Why Choose the Citizen Tsuki-yomi A-T BY1010-57H?
The Citizen Tsuki-yomi A-T BY1010-57H is an excellent choice for anyone looking for a Citizen moonphase watch, a Super Titanium Eco-Drive watch, or a radio controlled atomic watch with world time. It brings together elegant design, lightweight titanium comfort, advanced Japanese watch technology, and practical everyday durability.
If you are searching for a Citizen gray dial watch, a 43mm titanium men’s watch, a light-powered atomic timekeeping watch, or a premium Citizen Tsuki-yomi A-T Eco-Drive timepiece, the BY1010-57H stands out as a refined and highly functional option.
Instruction Manual for Caliber No. H874
For more details, visit the official Citizen website here.
Warranty:
This model includes Citizen’s 5-Year Limited Warranty for added confidence in your purchase.
▶︎Processing Time & Shipping Policy
▶︎Refund policy
We only carry CITIZEN USA products.
▶︎We DO ship internationally.
