NGC 1979 Kennedy half wrong planchet struck on SBA dollar blank.
The Kennedy half is struck on a Susan B. Anthony dollar blank, and weighs 8.1 grams, which is much less than the normal weight of a half dollar (at 11.34 grams.) The coin is missing some of the lettering and part of the date, since the SBA blank is smaller than that of a half dollar.
MS63 with lustrous white surfaces. A tiny spot at 9 o'clock on the obverse (which we mention for accuracy, as it is minor.)