Korea, Joseon Dynasty. Sang Pyong Tong Bo; 1 Mun. Military Training Command. 1857. (3.78g; 23.8mm). O./ 常 平 寶 通 [Sand p'yong tong bo; Department of Korean Yi Dynasty, currency unit]. R./ 訓 中 九 [(Hun):Hullyondogam Military training Command, (Chung): Middle, (Giy) Series/Furnace 9]. Mandel#28.11.9. $20