{"product_id":"citizen-tsuki-yomi-radio-controlled-moon-phase-eco-drive-watch-2026310341","title":"Citizen Tsuki-Yomi Radio-Controlled Moon Phase Eco-Drive Watch","description":"\u003cp\u003eIntroducing the Citizen 'Tsuki-yomi' Radio-Controlled Moon Phase - the world's first light-powered radio-controlled moon phase movement. To celebrate the 30th anniversary of the first CITIZEN radio-controlled watch they are debuting the world's first fully analogue moon phase function for light-powered watches.\u003c\/p\u003e\u003cp\u003eThe Tsuki-yomi collection (directly translating to reading the moon) features a new radio-controlled Eco-Drive Cal. H874 movement that provides ±15 seconds accuracy per month, revolutionary proprietary Super Titanium material and artfully crafted moon pattern dials. Based on a unique mathematical formula developed by CITIZEN called Luna Program, the watch calculates the phase of the moon each day from signals received from multi-band radio transmitters. The phase of the moon at the six o'clock position is then automatically adjusted and displayed. With a striking pattern of the moon's surface on the dial paired with a black outer ring, and a date display at the 4 o'clock position.\u003c\/p\u003e\u003cp\u003eSustainably powered by any light, including moonlight, with our proprietary Eco-Drive technology, this timepiece never needs a battery.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e5 year guarantee included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMovement\u003c\/td\u003e\n\u003ctd\u003eEco-Drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater resistant\u003c\/td\u003e\n\u003ctd\u003e100m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWatch type\u003c\/td\u003e\n\u003ctd\u003eClassic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrap material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBatteries included\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNFC enabled\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eCitizen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer's warranty\u003c\/td\u003e\n\u003ctd\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBracelet type\u003c\/td\u003e\n\u003ctd\u003eBracelet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComposition\u003c\/td\u003e\n\u003ctd\u003eTitanium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel name \/ number\u003c\/td\u003e\n\u003ctd\u003eBY1010-57H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003ePolished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrap colour\u003c\/td\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWatch face colour\u003c\/td\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"John Lewis","offers":[{"title":"Silver\/Grey","offer_id":48334279540974,"sku":"STO-ITEM-2026-310342","price":831.81,"currency_code":"GBP","in_stock":true},{"title":"Silver\/Red","offer_id":48334279573742,"sku":"STO-ITEM-2026-310343","price":831.81,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0522\/0125\/9183\/files\/112093818.webp?v=1784253609","url":"https:\/\/mcgrocer.com\/products\/citizen-tsuki-yomi-radio-controlled-moon-phase-eco-drive-watch-2026310341","provider":"McGrocer","version":"1.0","type":"link"}