The Vintage Alley Agate Pennsboro Red Fire Swirl Collectible from the 1930's is a rare and valuable find for marble enthusiasts. Made by the Alley Agate Co in the United States, this machine-made marble features a unique swirl style that sets it apart. With a mint condition of .63 inches, this collectible piece is a true gem for those interested in pre-1970 marbles. Its striking design and historical significance make it a prized addition to any collection.