Tsuki-yomi A-T
Atomic Timekeeping / Super Titanium™
Launched on 6/13/2025
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 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 deep purple 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 a 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 meters. Caliber H874.
Model #: BY1010-81Z
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Product Details
Model
- BY1010-81Z
Movement
- H874
- Eco-Drive
- Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries.
Dial
- Purple
Case
- 43
- Silver-Tone
- Super Titanium
Band
- Bracelet
- Super Titanium
- Fold Over Clasp with Push Buttons
Crystal
- Sapphire Crystal
- Superior scratch resistance and hardness
Water-Resistance
- WR100/10Bar/333ft [Swimming, Showering & Snorkeling]
Additional Functions
- Moonphase
- World Time in 24 Time Zones
- Radio Control
- Perpetual Calendar
- Day-Date
- Atomic Timekeeping
- Radio Control
- Perpetual Calendar
Reviews
Love that Citizen came out with a purple variant of this watch! It's so light on the wrist (especially on a rubber strap) that I find myself checking to see if it's still there. The legibility is great as is the information displayed. Definitely a fun watch to add to the collection.
Excellent Feature Packed Timepiece
The Tsuki-yomi is an excellent timepiece. The titanium construction makes it so lightweight and comfortable that you can forget you have it on. I was able to easily set my timezone and it received a good radio signal overnight bringing it within about 2 seconds of the time as checked via the internet. It looks stunning, feels fantastic, and is a true "grab and go" watch since I pretty much will never need to set it!
This watch is over the moon!
I love this watch. I got it two weeks ago, and it has hardly been off my wrist. Incredible accuracy, beautiful design, and titanium toughness secure the top spot in my collection for the Tsuku-yomi A-T Moonphase. When I first set it, the watch, it was the New Moon, and there was not a fingernail visible on the subdial. It has been cool watching as a mini moon face slowly waxed onto my watch until it reached Full Moon today. You know you want it with the purple dial. Go on! Get it!!!
Beautiful and Precise Tsuki-YomI Purple PCAT
I searched seven islands in the Caribbean looking for a "great deal" on this watch. Didn't find this collection anywhere. In my opinion, the Citizen PCATs are some of the best value watches made. I have several; it's neat to sit them all side-by-side and see the second hands perfectly in-sync. Got this one on an early black Friday sale at 30% off, direct from Citizen. This is a beautiful watch, drawing attention like all of my others. As others have pointed out, the purple is very subtle unless in the perfect lighting. Some of my PCATs are 30-years old but are still in perfect sync with the U.S. atomic clock. Again, great value. Beauty and precision.
Great Watch
This is a great looking watch. appropriate size on my wrist. Fast shipping.
One of the BEST
This is my third watch by citizens and this is by far my absolute favorite
Fantastic watch
Love that Citizen came out with a purple variant of this watch! It's so light on the wrist (especially on a rubber strap) that I find myself checking to see if it's still there. The legibility is great as is the information displayed. Definitely a fun watch to add to the collection.
Collection Complete
This makes #5 in my collection of all the different colors in this style. Purple is by far my favorite!
Awesome watch
I got this watch for my birthday, from my wife, we absolutely love it. I like purple and also we think the Moon phase is so cool. It weighs almost nothing due to the titanium. I think next is going to be the orange automatic! Great watch maker, period!!
Beautiful Watch
I wanted this watch the moment I saw it online and after receiving it and putting it on…WOW! This watch is just beautiful! I’ve had so many compliments and inquiries as to what kind of watch it is…. I would like to get all of the watches from this collection, soon.
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