The origin of this puzzle is unknow. There are patents from XIX century. My one is crafted with six identical pieces. The firs versions consist of three pieces with 2 v-shaped notches, two with an aditional noth a simple prismatic unnotched key piece.

This puzzle is the basis for a prolific and wonderful family of puzzles. The first one obtained by trimming piece edges at 45 degrees angle. It is the Diagonal Star ans is the first stellation of the rhombic dodecahedron.

• Pieces

6 identical

• Solution

Apart from trying a complicated 6-piece coordinated motion the pieces can be joined into two halves of 3 pieces each that then easily mate one against the other.