Any genuine coin with a genuine flaw would be worth something more than usual. The Australian 1966 10 cent coin has no documented occurence of any minting flaws. A reputable coin dealer should be able to give a valuation.
Other than for the two "E's" in ELIZABETH, there are no "E's" on an Australian 20 cent coin. If you have an "E" next to the Queen's head, somebody has stamped it there for some reason.
Modified coins have no collector value.
The last Australian Halfpenny was minted in 1964.
Decimal currency was not introduced into Australia until 1966. There is no such thing as an Australian pre 1966 cent.
There is no Australian "cent" from 1938. Decimal currency was introduced in Australia in 1966.
There is no Australian "cent" from 1939. Decimal currency was introduced in Australia in 1966.
Such a coin does not exist. The Australian "cent" coins were first introduced in 1966.
The Australian 2 cent coin was introduced at the changeover to decimal currency in 1966. There were no Australian "cent" coins minted prior to 1966.
There were no Australian 10 Shilling notes printed in 1966. 1966 is the year they were withdrawn after being replaced by the One Dollar note.
The last Australian Penny was minted in 1964. Their place in the Australian currency was replaced by the 1 cent coin in 1966.
Such a coin does not exist. The first Australian 20 cent coins were issued in 1966.
There is no Australian 1954 20 cent coin. Decimal currency was introduced in 1966.
There is no Australian 1950 20 cent coin. Decimal currency was introduced in 1966.
Such a coin does not exist. The first Australian 10 cent coin was issued in 1966.