Hard to believe this thread resurrected after lying around for seven years. By now, I would hope the OP found a good 60 to add to his rotation. Mine is an unpinned ADR prefix that I was told dates to 1982. I bought it a couple of years ago to replace th 642 I sold to a friend. I refinished the grips with Tung oil and added a Tyler T. It's a little tank that I love owning and carrying in a coat pocket while working around our place or riding my motorcycle.