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How big are/were the original LEGO bricks? What about those sold in Canada from 1970 to 1985/1990?

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    The same size as current ones? You can use bricks from the 1960s with current ones without issues. Are you thinking of something specific which isn't compatible?
    – Matthew
    Jul 11, 2017 at 6:55
  • Early LEGO bricks had grooves in the sides for windows to slide down, but they patented the exact size of the bricks so that should still be the same.
    – chicks
    Jul 11, 2017 at 13:21

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