The Citizen Tsuki-yomi A-T BY1010-57X represents a groundbreaking fusion of technology and artistry. As the world’s first moonphase watch combined with atomic timekeeping, this 30th Anniversary model embodies innovation and elegance. Its 43 mm silver-tone Super Titanium™ case features sharp, faceted edges for a refined, futuristic look, complemented by a rich green dial with black and silver accents. A moonphase display at 6 o’clock symbolizes the moon’s surface, while additional features include world time across 24 zones, perpetual calendar, day-date, and radio-controlled atomic precision. Powered by Citizen’s Eco-Drive technology, it harnesses any light source for continuous, battery-free operation. Water resistant up to 100 metres, this exceptional timepiece defines modern sophistication.
- Collection: Tsuki-yomi A-T 30th Anniversary
- Model: BY1010-57X
- Gender: Male
- Dial color: Green
- Movement: Eco-Drive (Calibre H874)
- Functions: Moonphase, World Time (24 Zones), Radio Control, Perpetual Calendar, Day-Date, Atomic Timekeeping
- Water resistance: 10 bar (100 m)
- Case material: Silver-Tone Super Titanium™
- Shape: Round
- Case size: 43 mm
- Lug width: 22 mm
- Crystal: Sapphire Crystal
- Band material: Super Titanium Bracelet