I have a Limited Edition LEGO set which has an embossed 4-digit (2755) number on the bottom. I'm curious to know what it is because I don't remember seeing one before. It would also be nice to know what the numbers under the barcode represent (118789 524)

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If I had to guess I would say it was a unique number given to each set in the production line of the set.

  • After looking through a couple of my LEGO boxes, I have discovered them all to have 118789 under the barcode. But I'm not sure what 524 means.
    – user6479
    Dec 3 '15 at 18:32

That number is not a real number, it is a production code (in your case, 27S5) consisting of 2 digits indicating the week of the year the set was made (in this case, the 27th week), a letter indicating the region the box was made in/for (R = US/Canada, S = Europe, I believe) and the last digit is the last digit of the year the set was made in.

So you have a Gingerbread house made in 2015, in the 27th week of the year (June 29, 2015 - July 5, 2015), and it was produced in/for the European market.

These codes typically go on the seals/stickers closing a box, but in case of smaller boxes that are supposed to be pushed open, the code gets embossed into the package.

And just for comparison - all my Gingerbread houses have production code 31R5 (I'm in the US).

UPDATE 5/2/2016: Here is a list of all the plants referred to by the letter code:

H = Nyíregyháza, Hungary
R = Ciénega de Flores, Mexico
S = Kladno, Czech Republic
Q = Purkersdorf, Austria
B = Shenzhen, China (Not Confirmed)
M = Billund, Denmark (Not Confirmed) 
O = Billund, Denmark (Not Confirmed) 

Note: list attributed to GiliusThunderhead over at the BrickPicker.com forums.

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