TETRAHEDRAL 2x2x2 CUBE (a)

TETRAHEDRAL 2x2x2 CUBE. Tetrahedron of 68mm edge length equipped with 2x2x2 cube mechanism such that each of the three rotation axes runs through the center of two opposite edges. Changes shape while being twisted. Colored stickers on black plastic. Made in East-Germany 1984 and sold as "Figurenmatch" (weighs 18g)