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Abanker's mark (orbankers' mark) is a symbol or letter stamped or scratched into many republican and early imperialRoman coins, whose purpose is unclear.[1][2][3][4]
The marks are found on either the obverse or reverse of a coin.[1]
Historians and numismatists have speculated that the marks may have been used to assess the purity of a coin's silver, demonstrate that it was not a plated forgery, for accounting or auditing purposes, or to denote that the coin did or did not have the specified weight.[1][5]
There is also debate as to why these marks stopped appearing after very early imperial Roman coinage.[1]
