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The Citizen Tsuki-yomi A-T BY1010-81Z is a radio-controlled atomic watch with a purple moon-phase dial, housed in Super Titanium with Citizen's Duratect surface hardening. It runs on Eco-Drive light power, so it never needs a battery change, and it syncs to atomic time signals for near-perfect accuracy. The titanium case and bracelet make it noticeably lighter than steel rivals, and the moon-phase complication plus perpetual calendar set it apart from simpler solar quartz watches. It suits buyers who want a low-maintenance, accurate everyday watch with a distinctive dial rather than a mechanical piece.
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Owners rate it highly, praising the light titanium feel, the striking purple dial and the accuracy of radio-controlled Eco-Drive timekeeping. Complaints are few and mostly about setting the complications and signal sync in weak reception areas.
The bracelet closes with a fold-over clasp.
It has a quartz movement and runs on Eco-Drive technology, which is powered by natural or artificial light, so it needs no battery replacement. A date display sits at the 3 o'clock position. The crystal is mineral glass.
Water resistance is 30 m (3 ATM). That covers splashes and everyday use, but the watch is not meant for swimming.
