1817 Rouble: Improved After Pocket Time?

Hi Stratocaster,
Yes, there is a prominent crack at that location. I do see a very slight loss of detail due to pocket wear, but in-hand I can still see all the vertical lines on the reverse crown. I think I've probably gotten enough improvement at this point and will return the coin to a holder, since I really don't want to lose much more detail.

I haven't a clue about the inscriptions. This coin weighs about 20.3 grams and has an edge inscription which includes the term "83 1/3" which I believe means it the silver content is 83.3%. That puts the total silver content well below a US silver dollar which is around 26.7 grams of 90% silver. The value relative to a dollar must be only about 70¢ based on silver content.

Thanks for the comment!

I think that "Chistago Serebra" means "pure silver", but it's curious that Zlotyn and Dollars are mentioned.
Was this the Russian equivalent of a " Trade dollar"?

Neither Polish zlotych nor American dollars are mentioned on this coin. Those are referring to obsolete units of weight, and untimately the fineness of the silver.

The zolotnik and the dolya were predecimal units of weight in Russia; there were 96 dolya to the zolotnik, which was equal to about 4¼ grams. See this wikipedia page.

The Polish currency, the zloty, was named after this Russian unit of weight.