The Akro Agate Co Prize Name Corkscrew Marble is a rare and collectible toy marble from the pre-1970 era. This machine-made marble features a unique corkscrew style and vibrant colors that set it apart from other marbles. With a diameter of 0.60 inches, this near mint condition marble is a sought-after piece for collectors of vintage marbles. Very hard to find colors, there is a small chip in the gray, still a very desirable marble.