One of the rarest orts of John Casimir.
The only Poznan orth with the Slepowron coat of arms - minted with only this one reverse stamp.
Very rarely seen in the trade, with high quotations over the years.
Poznan orts are minted between 1651 and 1659, falling almost entirely in the period of Boguslaw Leszczynski, of Wieniawa coat of arms, as Grand Treasurer of the Crown. He died on September 23, 1659, and was replaced by Jan Kazimierz Krasinski. However, his coat of arms - the Slepowron - did not stay in Poznań for long, as the issuance of orts in the city was completed later that year.
