Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (3.99g; 24.2mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 七 ( (Chong): General Military Office, (Qi) Series 7, Crescent to left]. Mandel#24.6.7 $15