Poland 1663-AT 30 groszy
"POLEN, Johann Kasimir, 1649-1668 30 Gröscher 1663 AT. Bromberg. Sehr schön-vorzüglich. (kingdom of Poland, John Casimir, 1649-88, thirty groschen of 1663, Bromberg mint. Very fine-extremely fine.)"This denomination is listed in the SCWC as simultaneously a gulden or a third thaler or a tympf. It was struck 1661-66 and weighs about one fourth of a thaler whereas the traditional tympf (18 groszy) weighed about a fifth of a thaler.
Recorded mintage: unknown.
Specification: silver, this specimen 6.58 g.
Catalog reference: KM 120, Gumowski 1769.
- Cuhaj, George S., and Thomas Michael, Standard Catalog of World Coins, 1601-1700, 6th ed., Iola, WI: Krause Publications, 2014.
- Richter, Jürg, Sincona sale 43, Gold and Silver Coins and Medals, Zurich: Sincona AG, 2017.