I love old Olympus OM-1 and OM-2 systems. The outside of the body is in great condition. How are the light seals? You should take it to a camera repair shop to see how accurate the light meter and shutter speeds are. Is the hot shoe cracked? If not, those can be worth a good amount.... relatively.
check the battery compartment to see if it leaked its a nicely made automatic camera, yours has a mediocre lens on it. looks pretty they are known for the foam on top of the prisim rotting and ruining the silvering. makes for an ugly viewfinder if not cleaned out before it happens