Nice piece.
Variation with the Lewart coat of arms and the initials IF of treasurer John Firlej and the rose sign and Herman Rüdiger's initials HR. Below there is also the mark of the berry of John Dittmar, the new mint master of the Posen mint.
Obverse: head facing right
SIGI 3 D G REX PO M D L
Reverse: an inscription in three lines
GROS ARG TRIP REG POLONIÆ
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