Generally games from that era have Mylar ( sometimes ) , If you can find a one that was done by the operator they usally only need a few minor paint touch ups ,
 Otherwise un-mylared games  around  mid - late 1970's will be down to wood around the bumpers inserts etc .
 Most games were flogged to death by 1983 , I know i did 
Go for a Mylared playfield if you can .
Good luck