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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 was marked as an exact duplicate of an existing question.

Similar question:… – 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.

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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