Citizen Tsuki-Yomi A-T 43 mm Blue Dial Super Titanium Eco-Drive Moonphase Bracelet [BY1010-57L]

The Citizen Tsuki-Yomi A-T [BY1010-57L] captures the beauty of the moon in a richly detailed blue-dial timepiece that places advanced functionality at its core. Created as part of Citizen’s 30th Anniversary celebration of radio-controlled technology, this 43 mm model is made in lightweight, exceptionally durable Super Titanium™. Its blue dial, accented in black and silver-tone finishes, recalls the texture and depth of the lunar surface, while the moonphase display at 6 o’clock provides its evocative focal point.

Citizen’s light-powered Eco-Drive Calibre H874 keeps the watch running from natural or artificial light, eliminating the need for regular battery replacement. Atomic Timekeeping helps ensure remarkable precision, supported by world time in 24 time zones, a perpetual calendar, and day-date indication. Completed by sapphire crystal, a Super Titanium™ bracelet, and 100 metres of water resistance, the Tsuki-Yomi A-T offers sophisticated moonphase character with genuinely useful everyday technology.

Technical Specifications

• Brand: Citizen
• Collection: Tsuki-Yomi A-T
• Model: BY1010-57L
• Movement: Citizen Calibre H874 Eco-Drive
• Power Source: Light-powered Eco-Drive
• Case Material: Silver-tone Super Titanium™
• Case Diameter: 43 mm
• Lug Width: 22 mm
• Dial: Blue with black and silver-tone accents
• Crystal: Sapphire crystal
• Bracelet: Super Titanium™
• Clasp: Fold-over clasp with push buttons
• Water Resistance: WR100 / 10 bar / 100 m / 333 ft
• Weight: 105 g
• Functions: Moonphase, Atomic Timekeeping, radio control, world time in 24 time zones, perpetual calendar, day-date

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