3N03 must have been produced in June of 13. If it was June 2003, 65438+ 10, the batch number would not be this. Guerlain used to be a five-digit batch number, but later it was changed to a four-digit batch number. The first digit is the year, the second digit is the month, and the last two digits are the serial number, which can be ignored. The months before 2008 are represented by a-m respectively (skipping I because it is too similar to1); After 2008 1 month, the month was changed to n-z (skipping o because it was too similar to 0). So, since your batch number is 3N, it must be 20 13.