Citizen Tsuki-Yomi A-T - BY1010-81Z

Experience a stunning fusion of breakthrough technology and premium design with the Citizen Tsuki-Yomi A-T – BY1010-81Z. As the world’s first moonphase watch combined with atomic timekeeping, this timepiece delivers unmatched precision and visual appeal.

Crafted with a 43mm silver-tone Super Titanium™ case, its sharp, faceted edges and elevated profile create a bold and modern look. The deep purple dial features black accents and silver-tone details, offering a striking yet highly legible display. At the 6 o’clock position, a beautifully designed window showcases the current moon phase—an homage to the moon’s surface and the inspiration behind the Tsuki-yomi name.

Built for functionality, this watch includes world time across 24 time zones, a perpetual calendar, day-date display, and of course, the signature moon phase complication. Powered by Citizen’s Eco-Drive technology, it runs on light—never requiring a battery change. With water resistance up to 100 metres and the advanced Calibre H874, this model is engineered for everyday durability and long-term performance.