Talk:CPC Binary Barcode

Back of letter
The backs of letters have a similar barcode on them in the lower-left corner, usually with wider-width bars. These do not co-ordinate with the symbology used on the front of the letter. Anyone know what this barcode is for? --Mozillaman (talk) 13:06, 5 December 2008 (UTC)
 * That's a serial number that is put on the back of an envelope when it is put on "hold" after the MLOCR finds the address on the front of the envelope unreadable. --  Denelson83  19:45, 5 December 2008 (UTC)