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In addition to LEGO and DUPLO names embossed inside the pieces of early DUPLO figures, there are a variety of number formats (one to three digits, some hyphenated) and in the case of 1977, the year.

Is there an explanation for what these numbers mean - and can they then be associated with a particular set and/or year?

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Similar question: bricks.stackexchange.com/questions/1399/… –  Kramii May 1 at 9:41

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