fisher 400-cx-2 pre amp what is the market like?

I have my Fathers Fisher 400-CX-2 pre amp in perfect working order. The system was taken down a few weeks ago to replace carpet and Mom has decided not to put it back together, and would like to put it on the market. There is also a KM-60 fm tuner that is also in great working order. The tuner has had two knob covers come off, and one is missing. I need to find a replacement knob face and find the correct method for gluing them on. Dad purchased the system one piece at a time in the early sixties and was the only owner. everything works as if it were day one. Any thoughts?