On 2013-10-11 auctions on the National Bank of Poland has been finished and issue's prices was established for coins commemorating Wisent (Bison bonasus).

Silver coin with the denomination 20 zł:
 - Reserve gross price: 140 pln
 - Selling price (price of issue): 140 pln
 - The number of coins to sell: 19.000 pcs
 - Total emission: 25.000 pcs
 - Auction starting date: 09-10-2013 08:00
 - Auction ending date: 11-10-2013 13:00
 - Date of issue: 24-10-2013

24-10-2013 is a day of issue coin with the denomination 2 zł and total mintage of 1.000.000 pieces.