This was made by Willi,  Thomas Pohle made a version for dealers with Willis permission. A very clever penetration of three solid blocks held in place by wooden swords inside a small “jewel cupboard”. The blocks are shown locked in place until the moment of release. The cabinet is shown completely empty, and the blocks and swords may be handed for examination. Similar to the well known version with six blocks, but this one has some extra finesse. Made of wood.