This is a remake version of the Karakuri Super-CUBI RF-4, one of the hardest Japanese Puzzle Boxes. It uses the trinary system and requires 324 moves to open and another 324 moves to close. The puzzle measures 7.7 CM and is made from Zebrawood.
I've heard some copies of this version are loose, but this one is in perfect condition. It's been kept in a temperature stable environment, and the first move is smooth and tactile. Comes with the original box and solution sheet. Selling to fund more puzzles :)
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