Building blocks have been marketed since the 19th century, when various companies marketed blocks made of stone and real bricks. Here are some sets sold in the USA during the 1940s and 1950s.
Block City - A popular line of the 1950s Erector Bricks - Bricks by A.C. Gilbert, the maker of Erector Sets Happi Time minature bricks - Marketed by Sears
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