Syrian pound
The characteristics of the 10 Syrian pound (10 SYP) coin have been found to so closely resemble the 20 Norwegian kroner (20 NOK) coin that it can fool vending machines, coins-to-cash machines, arcade machines, and any other coin-operated, automated service machine in the country. Whilst they are hardly similar to the naked eye, machines are unable to tell the coins apart, owing to their almost identical weight and size.