Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. General Military Office. 1757 AD. (3.99g; 25.7mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 捻 六 ( (Chong): General Military Office, (Liu) Series 4, Crircle to right]. Mandel#24.5.4 $16