Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Military Training Command. 1857. (3.63g; 23.6mm). O./ 常 平 寶 通 [Sand p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 訓 工 三 [(Hun):Hullyondogam Military training Command, (Kong): Work (San) Series/Furnace 3]. Mandel#28.6.3. $18