Citizen Tsuki-yomi A-T BY1010-57L – Super Titanium™ Eco-Drive Atomic Moonphase Watch
The Citizen Tsuki-yomi A-T BY1010-57L is a sophisticated Eco-Drive atomic timekeeping watch that combines advanced Citizen technology with a refined sport-luxury design. Featuring a blue dial, silver-tone Super Titanium™ case and bracelet, and a distinctive moonphase display, this model delivers precision, comfort, durability, and elegant everyday functionality.
Powered by Citizen’s innovative Eco-Drive technology, the Tsuki-yomi A-T runs on any light source and never requires regular battery replacement. With Atomic Timekeeping, Radio Control, World Time in 24 time zones, Perpetual Calendar, and Day-Date display, the BY1010-57L is built for those who appreciate advanced Japanese watchmaking and effortless accuracy.
Design Overview
The 43mm silver-tone Super Titanium™ case gives this watch a strong yet lightweight wrist presence. The blue dial is inspired by the surface of the moon, with a moonphase display positioned at 6 o’clock to show the current moon phase. Sharp faceted edges and refined silver-tone details create a modern, premium appearance, while the matching Super Titanium™ bracelet provides lasting comfort and durability.
The sapphire crystal offers superior scratch resistance and hardness, making this model well-suited for daily wear. With WR100 / 10 Bar / 333 ft water resistance, the Citizen Tsuki-yomi A-T BY1010-57L is suitable for swimming, showering, and snorkeling.
Key Features
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Citizen Tsuki-yomi A-T Collection – Advanced moonphase design with atomic timekeeping
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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 moon phase
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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: BY1010-57L
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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: Blue
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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 BY1010-57L?
The Citizen Tsuki-yomi A-T BY1010-57L 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 combines a lightweight titanium construction, a beautiful blue moon-inspired dial, and advanced light-powered technology in one refined timepiece.
If you are searching for a Citizen blue 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 BY1010-57L stands out as a highly functional and elegant option for daily wear, travel, and modern professional styling.
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.
