Well, if you're sure about that 6, then it must be 63242SA (what you thought was an 8 must be an S). You may have bought it in 1987, but that serial number indicates a 1972 production, making it a 2nd generation and worth more than a typical 3rd generation. If that is the case, you may well be able to get up around $1800 or more for it, though something about the color case on the right rear of the frame doesn't look quite right to me.
Good luck.
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