These are nice old rifles, reasonably well made and can be pretty accurate.
They are not full power, I've never chrono'd any of mine as I don't want to see how little power they probably have and shatter my boyhood illusions that they were really powerful
More of a junior plinker, only suitable for short range ratting or feral clearance.
For £75 it would need to be in very, very good condition.
HTH
Ben