Source: Luo Shubao (ed.), An Illustrated History of Printing in Ancient China, Hong Kong 1998, p. 98.
Two porters below and ten cash coins above, suggesting monetary payment for merchandise and its transportation, as shown on a sheet of “exchange media”, a form of paper currency with a value of no less than 770 hundred-cash strings or 77,000 cash coins, printed in Sichuan during the Northern Song period (960-1127 CE).