Tsuki-yomi A-T
Atomic Timekeeping / Super Titanium
When breakthrough technology and spectacular design meet, the Tsuki-yomi A-T is reading the moon. It’s the world’s first moonphase watch combined with atomic timekeeping innovation from Citizen, and this 30th Anniversary model is nothing short of impressive. The styling embodies the moon’s surface and a window at 6 o’clock displays the current moon phase. The timepiece measures 43mm in a silver-tone Super Titanium™ case, where sharp faceted edges pair with an elevated design throughout for an eye-catching aesthetic on the wrist. The blue dial works in tandem with black accents and silver-tone touches for a display that’s as handsome as it is legible. In addition to its running time, the watch features a moon phase display, world time in 24 time zones, a perpetual calendar, and day-date functionality. Powered by Citizen’s proprietary Eco-Drive technology to provide light-powered vitality without ever needing a battery. Water resistant up to 100 metres. Calibre H874.
Model #: BY1010-57L
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Product Details
Model
- BY1010-57L
Movement
- H874
- Eco-Drive
- Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries.
Dial
- Blue
Case
- 43 mm
- Silver-Tone
- Super Titanium
Lug
- 22 mm
Band
- Bracelet
- Super Titanium
- Fold Over Clasp with Push Button
Crystal
- Sapphire Crystal
- Superior scratch resistance and hardness
Water-Resistance
- WR100/10Bar/333ft (Swimming, Marine Sports)
Weight (g)
- 105 g
Additional Functions
- Moonphase Indicator
- World Time in 24 Time Zones
- Day/Date
- Radio-Controlled
- Perpetual Calendar
Reviews
A gift they loved!
I purchased this watch as a gift, and the recipient loved it! Shipping was very quick, and the watch was packaged perfectly. I’m so pleased with the experience.
LOVE it!
I own a variety of watches, but this one called to me the moment I saw it. The moonphase is beautiful, the dial is symmetrical and the titanium is so light! Very well made for the price. I highly recommend it.
Technology, Style, and Comfort—My New Daily Driver
I’ve owned a lot of watches over the years, and this Citizen Tsuki-yomi has quickly become my daily driver. The Super Titanium construction makes it incredibly light and comfortable to wear all day. Despite being lightweight, it feels solid and well-built. The blue dial and moonphase display give it a unique look that works just as well with a t-shirt as it does with business attire. The technology is what really sets this watch apart. Atomic timekeeping keeps it perfectly accurate, the Eco-Drive system means no battery changes, and the perpetual calendar and moonphase complication add functionality without making the watch complicated to use. What impressed me most is how Citizen packed so much technology into a watch that still looks elegant and timeless. It’s practical, reliable, and beautiful all at the same time. This has become the watch I reach for every morning. As my daily driver, it delivers everything I want: comfort, accuracy, style, and incredible technology. If you’re looking for a watch that offers exceptional value and everyday wearability, it’s hard to beat. Citizen absolutely knocked it out of the park with this one.
Fantastic watch
Wonderful watch! Everything I wanted, service was fast and sizing was perfect.