How did LEGO bricks look like in the olden days?
Can you also show me the bottom of a LEGO brick from the olden days?
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The earliest LEGO bricks were made in 1949, and they had completely empty undersides with vertical notches in two of their sides for attaching windows, doors and decorative cardboard inserts:
Then in 1958 (or 1961, depending on the country) the form known today was adopted, with tubes on the bottom and without notches: