I have a pair in oiled walnut, that I have completely restored. They have the original AR badges and original, unstained and almost perfect grill cloth. They are a nice speaker for the time period and they are one of only a couple of ARs that did not have the foam surround speaker foam, so the woofers will be good. The level control on the back should be serviced. It can be taken apart (without damaging it), cleaned and reassembled without any problem. You might need a can of Deoxit 5 to use as a cleaner/preservative.
Also the cap on mine changed values due to age, and needed to be replaced. I normally try to leave them alone, but these were way out of spec....