HKMAL collection
Qing Dynasty, Dao Guang Tong Bao (道光通寶), 1821-1850 AD, Dao Guang Tong Bao (道光通寶), "BOO YUWAN"/ Board of Works mint (寶源局), Peking. H-25.597s. 母錢/mu qian (seed or mother coin).	Asia China 1821