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