Citizen Eco Tsuki-yomi A-T - BY1010-57L

Experience a true fusion of innovation and celestial-inspired design with the Citizen Eco Tsuki-yomi A-T - BY1010-57L, the world’s first moonphase watch powered by atomic timekeeping. Created to mark the 30th Anniversary of Citizen’s groundbreaking technology, this timepiece is a celebration of precision, artistry, and futuristic engineering.

Crafted in a 43mm silver-tone Super Titanium™ case, the watch features sharp, faceted edges and a refined profile for a striking wrist presence. The deep blue dial, accented with black and silver-tone details, captures the essence of the night sky—highlighted by a moonphase display at 6 o’clock that mirrors the lunar surface.

More than just a beautiful statement piece, this advanced timepiece includes world time in 24 time zones, perpetual calendar, moon phase display, and day-date functionality—designed for collectors and modern explorers alike. Powered by Citizen Eco-Drive technology, it runs on light and never needs a battery, ensuring long-term sustainability and reliability. Water-resistant up to 100 metres and driven by Calibre H874, this watch delivers both premium style and cutting-edge performance.