No, it is a British Halfpenny. All Australian Coins will have Australia on them somewhere. British Coins do not have the country name on them. The sailing ship is Sir Francis Drake's "Golden Hind". The same reverse design was used for British Halfpennies from 1937 until 1967.
The Australian 1943 Penny was minted variously at the Melbourne Mint (no mintmark), Perth Mint (mintmark is a dot after the Y in PENNY "Y.") and Bombay Mint (mintmark is an "I" under King George's bust).
An Australian 1943 bronze Penny (George VI)(minted in Melbourne - no mintmark), uncirculated and in absolute mint condition could fetch up to $120 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $30 AUD. There were 11.107 million minted. An Australian 1943 bronze Penny (George VI)(minted in Perth - mintmark = "Y."), uncirculated and in absolute mint condition could fetch up to $115 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $28 AUD. There were 33.086 million minted. An Australian 1943 bronze Penny (George VI)(Proof)(minted in Perth - mintmark = "Y."), uncirculated and in absolute mint condition could fetch up to $40,000 AUD. An Australian 1943 bronze Penny (George VI)(minted in Bombay - mintmark = "I"), uncirculated and in absolute mint condition could fetch up to $135 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $30 AUD. There were 9.0 million minted. An Australian 1943 bronze Penny (George VI)(Proof)(minted in Bombay - mintmark = "I"), uncirculated and in absolute mint condition could fetch up to $40,000 AUD. A reputable coin dealer will be able to give a more accurate valuation.
There were no 1943 New Zealand Halfpennies minted.
Australian Standard Garratt was created in 1943.
Charles Grant - Australian politician - died in 1943.
John Knight - Australian politician - was born in 1943.
Bob Graham - Australian politician - was born in 1943.
Peter Black - Australian politician - was born in 1943.
Ian King - Australian cricketer - was born in 1943.
Arthur Cocks - Australian politician - died in 1943.
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George Harrison was born in 1943.