Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (3.49g; 24.6mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 一 ( (Chong): General Military Office, (Yi) Series 1, Crescent to right]. Mandel#24.5.1 $15