Design Science Toys LTD, Tivoli, NY, circa 1990's?
(wood with magnets, 4 inches)

Wood pieces with magnets, each in the shape of a rhombic hexahedron (a slanted cube), can be assembled into shapes, including the same shape as the Augmented Four Corners puzzle. The sheet that comes with the puzzle motivates the use of these pieces from the angles found in carbon molecules.