Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Pyongan Provincial Office. 1891. (2.99g; 22.3mm). O./ 常 平 寶 通 [Sand p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 平  二 日 [(Pyong): Pyongan Provincial Office (I): series 2, (IL): Sun] . Mandel#47.9.2 $20