A "Sydney Mint - Australia" 1870 22 carat gold Sovereign (Victoria), uncirculated and in absolute mint condition could fetch up to $3,650 AUD. If it has been circulated but still in good condition, it might fetch anything from $425 to $850 AUD.
Mintage is unknown.
A reputable coin dealer will be able to give a more accurate valuation.
What is often referred to as an "Australian" Sovereign or Half-Sovereign is a problem of categorisation.
British Sovereigns were minted at the Melbourne, Perth and Sydney Mints to the British pattern from 1871 to 1931 and have a Melbourne, Perth or Sydney Mint mintmark on them. These are definitely British Sovereigns, but minted in Australia (where the gold was mined from).
Sovereigns and Half-Sovereigns minted at the Sydney Mint for local use from 1853 to 1870 had "Sydney Mint" and "Australia" inscribed on them, but Australia did not exist as much more than a loose affiliation of British colonies. The loose affiliation got a little tighter in the 1890's, until Federation in 1901.
Australia does not produce any Sovereign coins.
The only "Australian" Sovereigns were minted at the Sydney Mint between 1853 and 1870. These have "SYDNEY MINNT" and "AUSTRALIA" clearly inscribed on the reverse. Any other Sovereign circulating in Australia would have been a British Sovereign minted to the British pattern. These may have been minted in either the London, Melbourne, Perth or Sydney Mints.
The Australian Ten Shilling note had "Half Sovereign" printed on them from 1915 to 1933. To get a valuation, please provide the serial number and the names of the two signatories.
With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" pennies minted prior to 1911.
A British 1870 Sovereign, uncirculated and in absolute mint condition could fetch up to £450 GBP. If it has been circulated but still in good condition, it might fetch anything from bullion value to £250 GBP. A British 1870 Sovereign (WW on trun), uncirculated and in absolute mint condition could fetch up to £375 GBP. If it has been circulated but still in good condition, it might fetch anything from bullion value to £175 GBP. A reputable coin dealer will be able to give a more accurate valuation. NOTE - The reverse of these coins is upside down to the obverse. This is normal.
We have an Australian flag to represent the country, like every other sovereign nation.
James Long - Australian politician - was born in 1870.
William Beckett - Australian politician - was born in 1870.
Other than British gold coins such as the Half-Sovereign, Sovereign, etc., Australia has never produced "Australian" gold coins for general circulation in Australia. The Sovereign coinage minted for Britain were minted to the British pattern from gold mined in Australia and were minted at either of the Melbourne, Perth or Sydney Mints (Mintmarks M, P or S respectively).
A Sovereign has a face value of One Pound (GBP). In today's currency, a quarter of a Sovereign would be 25 Pence.
James Blair - Australian judge - was born on 1870-05-16.
Harry Wright - Australian footballer - was born on 1870-04-04.