The first coinage of the occupied Poland goes as far back to 1815, and in around 1830, there were some Polish rebels that tried to declare their independence, however, they were crushed ruthlessly and hence, there was need of a dual denomination to remind the Polish that the Russians are there. (pretty evil isn't it?)
Polish coins
Neverthless, the Russians tried to fix the exchange rates, which is then fixed to 3 rubles to 20 zlot, 1.5 rubles to 10 zlots, and so on.
There were several denominations, which both silver and gold coins were minted. (no copper coins though)
The denominations are as following: 3 rubles-20zlot (gold), the rest are silver: 1.5 rubles-10 zlot, 3/4 rubles-5 zlot, 30 kopeks-2 zlot, 15 kopeks-1zloty minted till 1841 and after 1841, only 25 kopeks-50groszy, 20kopeks-40groszy were minted.
Both the Saint Petersburg mint (denoted as H|-) and the Warsaw mint (denoted as MW) minted the coins, but Saint Petersburg mint stopped minted in 1841, letting Warsaw to mint after 1842. Warsaw mint was later renamed to B.M. to mint copper coins after 1850.
Alas but not least, this is an example of the LARGEST silver coin ever minted in the Russian silver coin, and also the largest denomination of silver rubles (excluding trial coins
1.5 ruble - 10 zlot 1835


Details:
Weight: 1 FULL ounce, or 31.1 grams (HEAVY)
Edge: SIL(VER) OF 83 1/3 STANDARD 7 ZOL(OTNIKS), 27 21/25 PAR(TS)
(post too long, will continue on the next section




