Superbly preserved details, strong luster on both sides.
Obverse: crowned eagle, in the rim the legend: RZECZPOSPOLITA POLSKA ♦rok♦. On the sides of the eagle the designer's initials W - J, under the eagle's right foot the Kościesza coat of arms - the mark of the State Mint in Warsaw.
Reverse: stylized acanthus leaves, between them the number 1, below the inscription GROSZ.
Designer: Wojciech Jastrzębowski
Diameter: 14.7 mm; weight: 1.5 g; alloy: bronze; rim: plain
