Niner - some of them can look pretty beat up with the bluing shot, grips cracked and metal looking worn but somwe of these can shoot like a charm. And, if it is mechanically sound they can always be cleaned up and dressed nicely. However, these things were made in Argentina a long time ago and there is no tellin' how hard or soft the metal really is. None the less, I bought mine almost 40 years ago and she is still tickin'. I have replaced some innards and grips but otherwise she is fairly stock, and totally reliable.
If this one is reliable I would have it cleaned up and use it. Mikey.