An impressive and very rare pair.
20 and 50 pennies minted with specially prepared mirror stamps. Appreciated with a high PROOF type note by the NGC.
50 pennies made with a pair of stamps, which most likely were never used for minting circulating coins (both no circulating pieces are known to us, and no specialized catalogs describe them: Parchimovich (singles out 6 types) and Chalupsky (4 variants)). Among other things, it is characterized by a combination of denomination numerals.
The 20 grosz is the second of two types of mirrored 20-grosz coins, distinguished by widely spaced denomination numerals....
Mintage unknown.
Mint Vienna.
