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)

Source: Luo Shubao (ed.), An Illustrated History of Printing in Ancient China, Hong Kong 1998, p. 98.