This vintage Akro Agate egg yolk marble is a rare find from the 1930s, showcasing the classic oxblood swirl design in a corkscrew style. Machine made in the United States, this 0.61 inch marble is a unique piece that appeals to collectors of all ages. The vibrant colors and unique design make it a standout addition to any marble collection, reflecting the craftsmanship of Akro Agate during that time period. Top shelf marble. Awesome marble.