Oh my goodness!! I had no idea!
I would never have guessed the value. I received lovely letters of appreciation from both the National President and Historian. I'm actually glad it is safe and sound in it's new home in the Phi Mu museum. It was the strangest thing! Every now and then the badge would disappear, sometimes for weeks at a time, then show again in the most random places.
I hope that if I'm ever in the Macon area I would be welcomed to the museum and could see the badge on display.