Watch List notes:

Costa Rica, 1 colon, 1923 countermark (Type VIII) on a Costa Rica 50 centimos of 1918GCR, KM Plate Coin. KM-165. 9.90 grams. Lustrous AU- with circular polish lines on non-date side, bold countermark that neatly fits into the center of the design. The host coin is the final date of half dollars used for this countermark, which began in 1865 and terminated at this point due to the sharp increase in the value of silver after World War I. For the date-run of hosts from 1880 to 1918, this final date is the scarcest by far with this countermark. Plate Coin in the Standard Catalog of World Coins.
(125 - 200 USD)