Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Special Army Unit . 1750 AD. (4.16g; 24.1mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 营 八 ( (Yong): Special Army Unit, (Ba) Series 8, Crescent to right]. Mandel#25.5.8 $20