Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Government office of Pukhan Mountain Fortress. (4.0g; 25.8mm). O./ 常 平 寶 通 [Sand p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./  经 十  [(Kyong): Pukhan Mountain Fortress (shi): series 10] . Mandel#31.1.10 $20