What Australian pre-decimal coins have the most value?

Answer 1

Assuming that the coins are in reasonably good condition, and that they are general circulation coins rather than "Proof" or "error" coins, it would go something like this, in no particular order -

Halfpenny - 1923, 1915, 1918 and 1939.

Penny - 1920 (no dots), 1930, 1925 and 1946.

Threepence - 1915, 1912, 1914, 1923 and 1942M.

Sixpence - 1918, 1922, 1924, 1939, 1952 and 1953.

Shilling - 1915, 1915H, 1921*, 1933, 1911, 1912, 1914, 1924, 1939 and 1940.

Florin - 1914H, 1915, 1932, 1911, 1912, 1913, 1915H, 1919M and 1933.