COSTA RICA. Costa Rica - Costa Rica. 50 Centimos, 1923. San Jose Mint. NGC MS-66. KM-159. Issued by decree of 10 July 1923. Countermark: Type VIII bifacial, Obverse: Date; Reverse: Denomination. Countermark applied to an 1893-HEATON 25 Centimos. Delivering an intense visual luster and strong details, this premium Gem example delivers a stunning visual appeal an much charm to the eyes.