Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Treasury Department. 1757-1806 AD. (4.50g; 24.6mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 户 九 o  [(Ho): Treasury Department, (Jiy) Series Nine, Circle to right]. Mandel#13.13.9 $20