Thanks everyone, but I'm afraid nothing will work to weed out anything not 1959-1971 Nikon F only. Any other keywords would also go to filter out a portion the F's themselves. Especially words like "manual focus" or "body" and the like. Remember, people who know nothing of cameras and simply put up thrift-shop items, don't use these words.Come to think of it, without a finder, the Nikon F has no model stamped on it at all.