RRR-, Stefan Batory, Shelag 1580, Olkusz, Ryba -Glaubicz, POLO - the only known illustrated UNIQUE?

The only known piece with the ending POLO (instead of POL or PO), exactly the coin illustrated in Janusz Parchimowicz's catalog item 4.a3, and the author has not been able to find another piece either in private or museum collections. The 1580 shilling with the Glaubicz (FISH) coat of arms is one of the very rare and sought-after coins, Kopicki gave it a rarity of R4 and Tyszkiewicz valued it at 15 marks in gold. Apart from the offered piece, no other piece with the POLO legend is known, now a market UNIQUE. A coin for the best collections.