A very nice piece.
Variety of the legend LI/LITVA
Obverse: in the corded rim a narrow-bodied eagle, with its head heraldically to the right, with a spread tail, with four-pronged paws; in the outer rim a legend divided by three leaves:
SIGIS AVG REX PO MAG DVX LI;
Reverse: in the laced rim, the Pogon to the left, below it the date 1549, in the outer rim a legend divided by three leaves:
COIN MAGNI DVCAT9 LITVA;