<p>The markings are the Batch number and element id.</p>

CC BY-SA 3.0
2014-08-08T01:09:41.750Z
You should add more details to your answer like describing the format and your references
pcantin
CC BY-SA 3.0
2014-08-08T07:28:35.680Z
Woo, War Kings! (I blame and thank autocorrect)
gev
CC BY-SA 3.0
2014-08-08T09:45:31.920Z
I think they are Mould Ids rather than "batch" numbers specifically...
Zhaph - Ben Duguid
CC BY-SA 3.0
2014-08-08T00:49:39.433Z
2014-08-08T09:40:23.397Z
2014-08-08T09:40:23.397Z
user3896
<p>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.</p>

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

CC BY-SA 3.0
2014-05-01T09:41:48.383Z
Similar question: http://bricks.stackexchange.com/questions/1399/what-does-imprinted-information-inside-bricks-mean?rq=1
Kramii
<piece-information><duplo>
What do factory markings on the inside of DUPLO pieces mean?
George
# What do factory markings on the inside of DUPLO pieces mean?

(Asked by: username_0 on 2014-04-30)

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?

**Tags:** piece-information, duplo

> **Comments:**
> **username_1**: Similar question: http://bricks.stackexchange.com/questions/1399/what-does-imprinted-information-inside-bricks-mean?rq=1  

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## 1 answers

### Answer by username_2 on 2014-08-08. Score: -2

The markings are the Batch number and element id.

> **Comments:**
> **username_3**: You should add more details to your answer like describing the format and your references  
> **username_4**: Woo, War Kings! (I blame and thank autocorrect)  
> **username_5**: I think they are Mould Ids rather than "batch" numbers specifically...  

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