Dave and Matt just OUTSTANDING, I was hoping someone would come through but the two of you exceeded anything I could have hoped for. Matt your answer was more of a history lesson and filled in the few blanks that Dave left open.
Matt, not sure if the one you pictured is yours or not but any chance you can see the very small writing at the bottom of the circle in the black at the white line? Looks to say "MADE AND ...." is about all I can see.
One last thing Matt if this is one you have in your possession does it have the chrome looking tag near the top with the fill level on it? I would like to match it to the early DURO balancer sticker if I can.
Again my thanks to both of you guys for your help. I am truly impressed.
Randall