See it on Ebay here:
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Cheap, no reserve! Exquisite copper red (Shinsha) guinomi/sake cup. Shimaoka Sensei is a National Living Treasure.
The piece is approximately 2 and 7/8th" in diameter and 2 and
3/8th" tall. It is decorated in red, green and yellow enamel in resist windows. It is glazed in the difficult to find cooper red Shinsha glaze. The technique requires a feldspathic clear glaze brushed on. Then the circles are wax resisted and a layer of copper is applied, followed by another coat of clear glaze. A second enamel firing is done for the red/green/yellow decoration. This is a very nice, collector's quality guinomi.