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At first it looks like a pillowed 2x3x3 (aka Domino) but it is a 3x3x4 shaved down to the size of a 3x3x3.
The idea was conceived by Claus Wenicker after the first mass produced 3x3x4's were sold. The distance between the pillowed faces measures 57 mm which is the height of a standard 3x3x3.
The puzzle has a smaller number of distinct permutations because the eight corner pieces fall into two sets of indistinguishable pieces.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
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