I have contacted the dealer. They are standing by their assertion that it is an 1953 Izhevsk and have stated that if I would like to return it I will have to cover the cost of return shipping and insurance.
Thank you for letting us know about this situation. The photo of the receiver cover serial number makes it quite obvious what was done (but not by whom)
Although it does not change the value much since it is a refurb, you did buy it with the idea that you were getting an Izzy.