A poltina is one-half rouble. They have been minted in Russia for centuries, but this page applies only to poltinas minted between 1802 and 1810. They are valuable coins.
The example in our picture comes from Künker GmbH & Co. in Osnabrück, Germany where it sold for 1300 euros (about $1600 US dollars) during a 2010 auction. You can use this picture and value as a guide for assessing your own coin. CoinQuest thanks Kunker for use of their coin photo. It is nice one!
Very approximate catalog values run like this:
worn: $100 US dollars approximate catalog value
average circulated: $1000
well preserved: $4000
Values are highly dependent on wear, state of preservation, lack of problems (scratches, stains, cleanings, etc.) and eye appeal. If you have a nice-looking piece, take it to a knowledgeable collector or professional coin dealer for an in-person appraisal.