Watch List notes:

Mexico City, Mexico, cob 1/2 real, 1683 (L), very rare. S-M21; KM-23; Cal-150. 2.22 grams. Very rare with no more than five examples known and missing in the Banco de Mexico collection; VF piece struck on an inexplicably overweight triangular planchet, weak monogram side though clear final two digits of date, bold partial cross with rich rainbow toning in the fields.
($150-225)