Coins of this type were produced in 1816-1825 and in the years 1828-1835 at the Warsaw mint. In 1817 there were two kinds of eagles, in 1818, 1830 and 1834 - two initials of mintmaster. Among the coins of 1840 found error - marking "WW"instead "MW" Among coins 1822 to meet with a circular inscription on the reverse, and without it.
Photo source: www.fcoins.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.