Product Details

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 gray 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.

Model
  • BY1010-57H

Dial
  • Grey

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

Movement
  • H874
  • Eco-Drive
  • Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries.

Functions
  • Moonphase Indicator
  • World Time in 24 Time Zones
  • Day/Date
  • Radio-Controlled
  • Perpetual Calendar



WARRANTY: 5 Year limited warranty


About Us | Mia Monserrat Jewelry

Founded 20 years ago, Mia Monserrat Jewelry is dedicated to creating fine jewelry with timeless elegance. With our own factory and design studio, we have proudly supplied jewelers across the United States with exquisite, high-quality jewelry that has garnered trust and admiration. In 2024, we opened our first jewelry experience store in North Carolina to offer clients a more personalized, hands-on experience and enhanced service.

Today, we are bringing Mia Monserrat' s elegance online, making it easier for clients everywhere to enjoy our exceptional products and service. Our jewelry is not just a piece of art, it is a symbol of love. Whether expressing affection for a loved one or cherishing oneself, each piece carries a beautiful sentiment, enriching connections with those we care about.

Let Mia Monserrat Jewelry accompany you in every precious moment.


Returns:

To ensure a positive shopping experience, we offer a 30-day refund or exchange policy.

Please contact us through messages before returning an item (or exchanging it) so we can provide information on the return process. 

Once your return request is approved, you will receive instructions on how to return the item. We will process your refund immediately after receiving and inspecting the item.