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Playing for keeps: Collecting vintage marbles - Antique Trader

May 22, 2008 ... The earliest marbles were clay balls. ... It was the 17th-century German invention of water-powered mills that ushered in marbles made of stones. ... Marbles made of agate became so popular during the last half of the 1800s ... Accent speckles were created by rolling the heated piece over crushed glass.

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