What does an 1852 -1931 Australian Half-Sovereign weigh?

Answer 1

Sovereigns and Half-Sovereigns minted in Australia at the Melbourne, Perth and Sydney Mints, were in fact British Coins and were struck to the same dimensions, specifications and design as the coins would have been had they been minted at the Royal Mint in London.

The exception to this is the Sovereigns and Half-Sovereigns minted at the Sydney Mint between 1855 and 1870 which had "Sydney Mint" and "Australia" inscribed on the reverse, which were for the use of the Colonies.

Since 1816, all Half-Sovereigns were 0.917 fine gold, weighed 3.994 grams (half of the weight of a Sovereign) and 19mm in diameter.