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Tsuki-yomi A-T Atomic Timekeeping / Super Titanium™ BY1010-57L

Regular price $680.00
Sale price $850.00

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Get complimentary ground shipping on every order. Don't love it? Send it back, on us.

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Free returns within 10 days, please make sure the items are in undamaged condition.

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Support Online

We support customers 24/7, send questions we will solve for you immediately.

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.

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Michael Cinardo
June 26, 2025
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June 22, 2025
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Radenko Kasikovic
June 19, 2025
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Lucia DiMaggio
June 19, 2025
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heidi neufeld
June 15, 2025
They have beautiful pieces , staff is really ...
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daniel shenouda
July 10, 2025
Great service, beautiful custom jewelry, and ...
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Sunil Sarang
July 10, 2025
Excellent customer service.
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Orit Daniels
July 6, 2025
Beautiful place and jewelry. Professional, fr...
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Stephanie J Zhu
July 2, 2025
Awesome experience getting watch strap and ba...
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Michael Cinardo
June 26, 2025
Tyler was amazing. She was cheerful, knowledg...
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Praveen Marwah
June 22, 2025
I recommend this place. Very courteous servic...
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Delilah Cruz
June 22, 2025
I brought multiple pieces of different jewelr...
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Radenko Kasikovic
June 19, 2025
Nice place, extremly helpful associates, exce...
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Lucia DiMaggio
June 19, 2025
I am so happy I found Shoshany Jewlers. It re...
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heidi neufeld
June 15, 2025
They have beautiful pieces , staff is really ...
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daniel shenouda
July 10, 2025
Great service, beautiful custom jewelry, and ...
Read More
User Image
Sunil Sarang
July 10, 2025
Excellent customer service.
User Image
Orit Daniels
July 6, 2025
Beautiful place and jewelry. Professional, fr...
Read More
User Image
Stephanie J Zhu
July 2, 2025
Awesome experience getting watch strap and ba...
Read More
User Image
Michael Cinardo
June 26, 2025
Tyler was amazing. She was cheerful, knowledg...
Read More
User Image
Praveen Marwah
June 22, 2025
I recommend this place. Very courteous servic...
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Delilah Cruz
June 22, 2025
I brought multiple pieces of different jewelr...
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Radenko Kasikovic
June 19, 2025
Nice place, extremly helpful associates, exce...
Read More
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Lucia DiMaggio
June 19, 2025
I am so happy I found Shoshany Jewlers. It re...
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heidi neufeld
June 15, 2025
They have beautiful pieces , staff is really ...
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Brand History

In the Japan of the 1920s, most of the watches sold were pocket watches imported from overseas. Determined to create a Japan-made rival product, the Shokosha Watch Research Institute, the precursor of CITIZEN, launched its own pocket watch in 1924. As a first product, it was magnificent—but it lacked a name. Tokyo Mayor Count Shinpei Goto was asked to suggest one. The name he came up with was “CITIZEN,” an expression of the hope that as many people as possible—citizens—would use and cherish the watch for a long time.