We attach a small label to either the side of the magnet or on the inside arm of the basket with our spec number and manufacturing/date code on it.  The spec number will begin with the size of the speaker (i.e. for a 10" it would be 101123).  The manufacturing/date code number is as follows: 

Example:    EIA# for ESC       Year      Week      Serial #       Metal Group
                         67                  -01        12A         0217              G1

The "67" tells you that the speaker was built by Eminence, the "01" indicates that the speaker was built in 2001, and the "12" means it was built the 12th week of the year.

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