A very nice piece. Well preserved silver plating, rubbed only in a few places.
Original ribbon preserved.
Obverse: half-figure of Jagiello in front, holding a cross and a sword, on its sides the coats of arms of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania, and a legend:
WŁADYSŁAW JAGIEŁŁO/UR 1348/UM 1434;
Reverse: MEMORANDUM/OBCHODU/500 ROCZNICY/BITTY POD/GRUNWALDEM/1410-1910;
Silver-plated bronze, dimensions 24 x 24 mm, total weight 7.97 g.