Cannot really help you here, sorry. But this dealer for example http://www.ma-shops.de/olding/item....RGBP&lang=en has the same groschen, dated 1530, and lists these references: Neumann 45, Slg. Marienburg 1123. The Neumann is a catalog of Prussian coins; the catalog of the Marienburg collection was written by E. Bahrfeldt some time in the 1920s ...
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