Nice Merc and charm too.
That C I OF A is going to drive me crazy though.
A probably stands for America...
It's been driving me crazy.
Same design as yours...
Congrats on the old Merc and the charm!
C I of A...hmmmm...
Central Intelligence of America?
Perhaps you could contact the company to see if they have a record of this pin they made? http://www.bastiancompany.com/about.shtml