Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Treasury Department. 1757-1806 AD. (3.56g; 23.6mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 户 十 o  [(Ho): Treasury Department, (Shi) Series Ten, Circle to right]. Mandel#13.13.10 $18