Mine says 1973x on the back, so it is a reissue right?An original would have a hardwired AC plug and no shield over the output tubes.........reissues have a removable cord and that metal cage over the tubes. A reissue cage could have been removed but the chassis would have the screw holes to mount it. Should also have the little white tag stapled to the back of the cab.......original 1973, reissue 1973X. Been awhile since I saw mine but the serial number is on the side of the chassis, not visible unless you pull it from the cabinet. (....if I'm remembering rightly....)