Nobody was Crowned in 1928 and Australian Sixpences were never issued as commemoratives.
An Australian 1935 sterling silver Sixpence (George V), uncirculated and in absolute mint condition could fetch up to $1,600 AUD. If it has been circulated but still in good condition, it might fetch anything from $16 to $325 AUD. There were 392,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1934 sterling silver Sixpence (George V), uncirculated and in absolute mint condition could fetch up to $900 AUD. If it has been circulated but still in good condition, it might fetch anything from $7 to $160 AUD. There were 1.024 million minted. A reputable coin dealer will be able to give a more accurate valuation.
Most Australian Sixpences from 1911 to 1924 in absolute mint condition could get values in excess of $1,800 AUD. The 1918 Sixpence would probably have the geatest value. Coins in less than mint condition might get anything from $10 to $800. A reputable coin dealer will be able to give a more accurate valuation.
There were probably a lot of Coronation books. One common one is To Commemorate the Coronation of His Majesty King George Vby Charlotte M. Yonge, which is worth somewhere around $150 at most.
An Australian 1953 Sixpence, uncirculated and in absolute mint condition could fetch up to $400 AUD. If it has been circulated but still in good condition, it might fetch anything from $3 to $75 AUD. There were 1.152 million minted. An Australian 1953 Sixpence (Proof), uncirculated and in absolute mint condition could fetch up to $30,000 AUD. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1911 sterling silver Sixpence (George V), uncirculated and in absolute mint condition could fetch up to $2,100 AUD. If it has been circulated but still in good condition, it might fetch anything from $14 to $300 AUD. There were 1.0 million minted. An Australian 1911 sterling silver Sixpence (George V)(Proof), uncirculated and in absolute mint condition could fetch up to $90,000 AUD. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1938 sterling silver Sixpence (George VI), 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 $2.50 to $22 AUD. There were 2.864 million minted. A reputable coin dealer will be able to give a more accurate valuation.
The Sixpence was not introduced into the currency until about 1550.
An Australian 1917 sterling silver Sixpence (KG V), uncirculated and in absolute mint condition could fetch up to $2,350 AUD. If it has been circulated but still in good condition, it might fetch anything from $15 to $490 AUD. There were 1.632 million minted. A reputable coin dealer will be able to give a more accurate valuation.
Whats the coin shilling sixpence,penny? some more detail please
With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" Sixpences minted prior to 1910. The only Sixpences circulating in Australia prior to 1910 were British Sixpences.
There was King George V and King George VI. To get an estimate of value on an Australian predecimal banknote, you will need to provide the two signatories on the note and the serial number.