A nice piece. Patina. Rarer version in silver.
Obverse: national eagle over a composition of agricultural and industrial symbolism, in the rim legend:
POZNAŃ 1929 YEAR UNIVERSAL NATIONAL EXHIBITION;
Reverse: map of Poland, above it dates 1918-1928, along the rim legend:
ON THE TENTH ANNIVERSARY OF THE REBIRTH OF POLAND;
Silver, diameter 27 mm, weight 11.35 g.