My immediate thought is that it's post 1980's. Eastern Bloc stuff started flooding in to the American surplus market after the Berlin Wall came down and when the U.S.S.R folded all the Soviet stuff came flooding in as well. There should be a tag inside maybe in an inside pocket, if you can find one and post a pic that will help.
I don't know what you paid, but I see the Red Army enlisted mens versions going for around $40-$50 retail in a store down here, yours may bring more being an officers coat, but I really don't know the market for the Russian stuff post WW2