RR-, Kingdom of Poland, 1 penny - 10 pennies 1840 MW

A very interesting case of converting an original 1 one-grosz coin in the era into a 10-grosz coin. The practice was described in the 19th-century press as a popular fraud, but almost no numismatic evidence of this practice has survived until our time. An interesting and rare numismat, confirming written sources. 5 years ago we offered a similar numismatic coin from 1839 https://wda.onebid.pl/pl/monety-r-krolestwo-polskie-1-grosz-10-groszy-1839-mw/246624