Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Sonhyenchong Rice and Cloth Department. 1806 AD. (3.78g; 23.8mm). O./ 常 平 寶 通 [Sang p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 惠 二 (Hye): Rice and Cloth Department, (I) Series/Furnace 2]. Mandel#20.1.2. $40