1979 Australian 20 Cent Foreign Planchet Error

1979 20c Struck on a Nepalese Rupee Planchet

At last nights monthly meeting a member showed a 1979 20c that was struck on a Nepal Rupee planchet. With a weight of 7.5g it is severely underweight to the 11.3grams a 20 cent should weigh showing strike weakness and fishtailing because the planchet was too small for the coin collar. In 1979 the Royal Australian Mint in Canberra struck 30 million Nepalese rupees and were still manufacturing their own planchets. A wrong planchet was used to strike the Australian 20c pictured.