The Isabella quarter is a favorite of many for a couple reasons: first, it is the only classic commemorative quarter produced by the US mint. Second, it is the only circulating US coin with the image of a woman. Third, it is a lovely design which was made for the Columbian exposition to honor the board of female managers. These little silver commems are highly sought after - the chance to buy one in MS66 with CAC approval seemed like an obvious win.