How much is?

This is a Russian model. "BR". Rather model of Soviet times. Their production had been a long time. Currently, this model is no longer produced. In the production used the labor of prisoners.
These two models have the serial numbers of the rare " B2000" and " B2222."
I got them from an elderly collector from Russia.
Weight of one product over 500 grams.
Now I want to know. Tell me please.
For how much can be sold one such product?
Thank you.