History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c14.s1.4

v1.c14.s1.4

Some cast coins found still joined together by a bar of metal indicate that these were cast in pairs. Each pair of moulds (bearing obverse and reverse devices), facing each other, were jointed with another pair of moulds by a channel. Molten metal poured probably through a hole in the channel, could flow into each socket. But in the process some portion of the metal could have sometimes dried up in the channel resulting in a bar joining both the coins. Ordinarily the bar should have been broken and detached from coins. But sometimes this was (mistakenly) left attached to the pair of coins.