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Atomic Timekeeping / Super Titanium™
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Product Description
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 meters. Caliber H874.

Tsuki-yomi A-T
Order by 2pm EST for same day shipping
Orders with sizing require additional processing time.
Bracelet sizing adds additional processing time.
- Bracelet sizing requires an extra 1-2 business days for processing, prior to shipping, as sizing is handled on demand by one of our expert technicians.
- Orders placed after 2pm on Friday or on weekends will ship from our facility on Monday (excluding holidays).
- Overnight shipping is available for an additional fee.
Free Bracelet Sizing
5 Year limited warranty
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STORE HOURS
Monday, Tuesday, Wednesday: 10AM to 7PM
Thursday, Friday, Saturday: 10AM to 8PM
Sunday: 11AM to 7PM


Product Details
Model
- BY1010-57L
- 12/19/2023
Movement Technology
- H874
- Eco-Drive
- Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries.
Case Width (mm)
- 43
Lug Width (mm)
- 22
Band Type
- Bracelet
- Super Titanium
Case Material
- Silver-Tone
- Super Titanium
Crystal
- Sapphire Crystal
- Superior scratch resistance and hardness
Clasp
- Fold Over Clasp with Push Buttons
Dial
- Blue
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
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Reviews
Exquisite
The watch brings accuracy to the highest level. Details sre impeccable. My favorite of all my citizen watches.
Stunning watch...
I ordered this here from Citizen as the one I purchased from Zales was improperly sized and the links /band fell apart so back it went. Sizing here was also a problem. It arrived so much smaller than my measured size but Citizen agreed to allow 25.00 towards getting it done at a local authorized dealer. Happy to say the dealer did not charge me but agreed that the sizing was way off from what I asked for. Okay..now back to the watch. It's so beautiful in person. It looks great in photos and videos but you really have to see one for yourself. Set up is so simple and the radio control works perfectly. I found leaving it overnight by a window is the way to go with this feature. The band is very comfortable and the watch is light compared to my mechanical watches but not all that light. Band can also be swapped out easily should you want to use a leather or rugged nylon band for everyday use. My go to Citizen dealer has these all in stock now for a super low price but Citizen says they cannot match it since their website shows a higher price than the one offered to me.Yes they ARE an authorized dealer. I am thinking about the RED as a Xmas present for myself..lol. All in all, this is a stunning watch in blue and it's easy set up makes it a must own!
Papapotato
Love it!
Fantastic watch
Watch fit perfectly and is comfortable the links on the wristband do not pull the hairs in my arm. It is an incredibly beautiful time piece