Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (3.96g; 23.7mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 四 o (Chong): General Military Office, (Is) Series 4, Circle to right]. Mandel#24.2.4 $15