Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (4.35g; 25.7mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 十 o (Chong): General Military Office, (Shi) Series 10, Circle to Left]. Mandel#24.3.4 $17