A very nice piece.
Variety with M D L legend ending indicating a 1662 vintage.
Second vintage of John Casimir's sixpences of Poznan with characteristic bust and initials of Nicholas Gill - administrator of the Poznan mint on the reverse.
Obverse: royal bust in armor with 4 buttons on the chest, with a protruding lace collar, with a cloak fastened with a rosette-shaped jewel, in the rim a legend punctuated by the Ślepowron coat of arms:
IO-CAS-D-G-REX-POL&SvM-D L-;
Reverse: crowned two, slightly curved coat-of-arms shields with the coats of arms of the Crown and the Grand Duchy of Lithuania, between them a rosette and -, above, under the crown the denomination mark VI, below, the initials -N-G- divided by the Slepowron coat-of-arms of the Vasa dynasty in an ornamental coat-of-arms shield, in the rim a legend:
GROS-ARG-SEX REG-POL 1662;
