In the beginning I collected EVERYTHING in Imperial numismatics, now I figured out what I am really interested in.
Sorry to mislead you, I meant minor coppers of A1 - 2 kopeks and less. I probably used a wrong term. It is tougher than silver, if you ask me.
Checked my 1808 KM 5 kopeks. It is different from yours. I acquired it in 2000 from Gorny 103 auction. Lot 2237. I paid $225. It sold in WWCC in 2011 for 175
I think this 5 kopek series lost its appeal, since too many of these coins were dug out in Russia in the past 10 years or so.