>my J-36 VP is SR NR 1 , dated 10-29-36 >He! He! Gloat!, Gloat! >Don K8OMO All I can say is... wow! Certainly an important reference point for Vibroplex production dating. Have you contacted Tom French or Mitch, W4OA about it? They would probably want to know. Does it have the small or large type nameplate? Rich, N8UX.