Pattern 20 Zlotych 1964 MW WK "A woman with ears of corn". Copper-Nickel (Poland, Peoples Republic)

Where can I sell the Pattern 20 Zlotych 1964 "A woman with ears of corn" with the letters MW WK, Copper-Nickel?

To sell the Pattern 20 Zlotych 1964 "A woman with ears of corn" with the letters MW WK, Copper-Nickel we recommend contacting specialized numismatic companies that hold regular auction sales. Public auctions are the most fair and secure way to sell valuable collectible coins. Go to the list of companies to find a suitable platform.