Coins of this type were produced in 1817-1820 and 1826-1835 years at the Warsaw mint. In 1839 there were two kinds of eagles. In 1818 there were two kinds of eagle, in 1829-1832 and in 1834 - two initials of mintmaster.
Photo source: rcoins.ru
After the war with Napoleon was held at the Congress of Vienna, which decided the question of state borders in Europe. To the Russian Empire
ceded the Duchy of Warsaw - the main part of Poland, repeatedly shared with 1772 between Prussia, Austria and Russia. In 1816, at the Warsaw mint began minting copper, silver and gold coins with inscriptions in Polish, which lasted until 1850. Included two types of coins. Later they were replaced by nationwide, which was used before the independence of Poland in 1918.