I got this one when I first stated collecting revenue's...AMITY is in Erie County,PA.Erie,PA.&County is my main focus BUT any revenue is cool to me!! I love the way the bottom is cut,Like 17th.&18th.Cen.Document's...Cut so the "other" person can line their paper up to match.Early form of counterfeit detection...HAPPY HUNTING!!
That idea of cutting an edge as a security measure is very old, going back hundreds of years. Sometimes a manuscript series of circles, ovals or other designs was written (or printed)first, and than the paper was cut.