A mint mark is a letter, symbol or an inscription on a coin indicating the mint where the coin was produced. It is distinct from a mintmaster mark, the mark of the mintmaster.
Mint mark and privy marks on French Cochinchina 20 Cents 1879, Paris Mint
Spanish Milled Dollar with Mexico City Mint Mark.
Carson City Mint 1872 "Liberty Seated" silver dollar reverse, bearing the mint's CC mint mark just beneath the eagle.
Mintmaster marks are often the initials of the mintmaster of a mint or small symbols for example at the size of the letters on a coin inscription to denote the coins made under his direction. With his
Erbland thaler (Broad thaler) John George II, 1662, mmz. C–R and acorn, mintmaster Constantin Rothe, Dresden Mint
1347 florin with coat of arms and issue mark
Speciesthaler 1763, mmz. I F ô F, mintmaster Johann Friedrich ô Feral, Leipzig Mint. On the arm section Signum S, medallist: Johann Friedrich Stieler
Hesse-Cassel, Weidenbaumthaler of 1628, Mmz.: TS as a monogram between the horns of the landgrave's helmet