I know that you've seem them on eBay and the like. I found one for a reasonable price and got it put together (in spite of the Japanese only directions). It wasn't too hard - good pictures but the lack of color threw me when installing motors initially - it has a motor each for the hours and mins that turn different directions.
VIDEO: Otona no Kagaku Radio Wave Flip Clock
See the Video
VIDEO: Otona no Kagaku Radio Wave Flip Clock
See the Video
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