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This question already has an answer here:

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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marked as duplicate by Zhaph - Ben Duguid Nov 21 '14 at 14:56

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Similar question: bricks.stackexchange.com/questions/1399/… – Kramii May 1 '14 at 9:41

The markings are the Batch number and element id.

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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You should add more details to your answer like describing the format and your references – pcantin Aug 8 '14 at 1:09
    
Woo, War Kings! (I blame and thank autocorrect) – gev Aug 8 '14 at 7:28
    
I think they are Mould Ids rather than "batch" numbers specifically... – Zhaph - Ben Duguid Aug 8 '14 at 9:45

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