I just noticed that there is another difference in Duplo 1x2x2 bricks.
Must there be a third entry or keep it as it was?
See pictures.
First one is the standard at Bricklink. At the second you can see the difference
between 4066 and the brick I found (yellow one). The third picture shows that
it was already 1993 when this brick was made.
Netherlands, Zuid-Holland
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USA, Oklahoma