If I am not mistaken, there are six units "out there" that are unnumbered units and these were the very first units ever produced. They were all sent out to the very first North American customers. How long have you had your units? Did you buy your units second hand? Does the outer cardboard box that your IEMs came in have a S/N on the side?
Edited by bangkokkid - 10/24/12 at 10:32pm