Zinnenthurmheller. A base silver coin of Freistadt in Silesia, issued during the sixteenth century. It has on the obverse the letter M, generally supposed to stand for the princess Meehtildis, and on the reverse a tower, from which it obtains its name. See Friedensburg, Schlesien's Neuere Munzgeschiehte. 1899 (No. 638).