I have done a little more research on the terminology- COUNTERSTAMP is an official punch mark to signify legal tender status of a foreign coin or change in value of a domestic coin [eg, Spanish dollars counterstamped with image of George III]
Pawn shops usually charge less than other shops. Many of my friends love coin collection and they visit pawn stores more often. There is local pawn shop named cash pawn sales, ithey say its one of the best to offer cheap coins.