As I understand it, George played with a Duncan Distortion durring his Dokken years. However, I think it was durring his later years Lynch Mob and later that he want to Seymour and asked for a custom pup.
That's what I've read from the scatterings of posts I've seen on various guitar and Lynch/Dokken related sites.
[U]Ricks Current Mystery Video[/U] - Updated Monday March/02/2015