Rare Mother Coin 母錢 Tong Zhi Tong Bao China 1862 Bao Quan Beijing Board of Revenue Mint
ANCIENT CHINA, Qing Dynasty
Mother coin, 母錢
Bao Quan, Beijing Board of Revenue Mint !
Reference: Hartill 22.1125
Weight: 5.3 grams; Size: 25 mm; Material: Brass
Reign title: Tong Zhi, 1862-74
Obv: Tong Zhi Tong Bao
Rev: Manchurian inscription "Bao Quan"
Mother Coins 母錢 in old Chinese coin making
During the Han Dynasty, Chinese mints partially solved the inconsistencies in cast coins by using bronze master moulds. Master moulds were used to prepare the clay moulds which will be used for the actual casting.
Mother coins are pressed on the wet sand in the wooden frame (first half of the mould). Rods are placed between the coins to create channels where the molten metal can flow. A second frame (second half of the mould) is placed on top and pressed tightly. This imprints the designs of the obverse and reverse of the mother coins on the sand in the frames.
Emperor MU TSUNG