Very rare, technological sample of the first twenty-dollar coin with Marceli Nowotko.
Minted in cupronickel in an edition of only 20 pieces.
Made with a different obverse stamp than the nickel issue (smaller eagle), as shown in Janusz Parchimowicz's "Polish Sample Coins 1949-1990" catalog.
The variety with the PRÓBA inscription above.
Nickel, diameter 29 mm, weight 10.08 g.