Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (3.81g; 24.9mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 五 o (Chong): General Military Office, (Wu) Series 5, Circle to left]. Mandel#24.2.5 $15