The Alley Agate "Shimmering Spruce" Swirl Marble is a vintage machine-made marble with a unique swirl design, originating from the United States before 1970. This collectible marble is approximately 0.62 inches in size and is loaded with aventurine, adding a shimmering and colorful element to the piece. Perfect for marbles enthusiasts aged 12 and up, this Alley Agate marble is sure to be a prized addition to any collection.