I found passport for FED-50.
Camera made in May 18, 1987.
Original price 90 rubels.
After few price reductions camera sold in August 30, 1988 for only 25 rubels.
What was going on at this time? As I can remember it always was hard to find good camera in the stores. Or may be FED-50 was not considered a good camera?
http://www.ussrphoto.com/UserContent/DSCF6606.JPG
http://www.ussrphoto.com/UserContent/DSCF6607.JPG