Poland - Congress Poland - Złoty (1815-1841) - after a brief examination, I figured out that they were all minted in Warsaw and that they have cousins in Russia (Russia - Empire - Ruble (1700-1921)).
Examples:
https://en.numista.com/catalogue/pieces63932.html
https://en.numista.com/catalogue/pieces15689.html
However, not all of them (that were made in Warsaw) are listed under Poland, and some are listed under Russia instead. Some of Russian coins point to Polish catalogues, some Polish to Russian ones.
So, there is a clear inconsistency in the catalogue. What should we do about that? There are several posibilities.
Under influence of some catalogues (I posses one of those), we can create new coins in Poland and push all those coins minted in Warsaw into Poland.
Or we will do the oposite, and push those coins to Russia instead.
My personal opinion - Move the all to Russia.
Why?
- Poland has its own currency - Groszy and Zlote during Congress era (1815-1841)
- Russian coins that are there - are minted in 1850's and 60's which is also out of range! (1815 - 1841)
- Poland - Congress Poland - Złoty (1815-1841) I do not see Rubles here. I see Złoty
- If I got a new Kopějka , I will never start my search in Poland, but I will always start in Russia
- It is a nice example, that we should rather use that hay we got in our skull, and do not follow catalogues blindly.
- We could anger some Polish. As they will be robed of coins.
- Some collectors may observe not really understandable personal nationality changes in their coins which may result in unintended consequences, like civil wars in albums.