British Quintuple Sovereigns, Double Sovereigns, Sovereigns and Half-Sovereigns were minted variously at the Royal Mint London (no mintmark), the Melbourne Mint (M), the Ottawa Mint (C), the Perth Mint (P), the Pretoria Mint (SA) and the Sydney Mint (S).
On coins with the Crowned Shield reverse, the mintmark, if there is one, appears below the wreath on the reverse.
On coins with the St George and the Dragon reverse, depending on the year, the mintmark can appear below the bust of Queen Victoria or, below the ground and to the right of the year on the reverse.
All of these coins are British Coins irrespective of where they were minted. The coins were usually minted where the gold was mined from to save the expense of transport and the potential hazards of transport by sea.
Australian coins minted at the Melbourne Mint do not have a mintmark.
Australian Threepences minted from 1910 to 1915 were minted at the Royal Mint London and have no mintmark. Australian Threepences minted from 1916 to 1926 were minted at either the Sydney Mint or the Melbourne Mint. Sydney Mint coins have no mintmark, the coins minted at the Melbourne Mint and have an "M" below the date. Australian Threepences minted from 1927 to 1941 were minted at the Melbourne Mint and have no mintmark. Australian Threepences minted from 1942 to 1944 were minted at the Melbourne Mint, the San Francisco Mint (USA) and the Denver Mint (USA). The coins minted at the Melbourne Mint have no mintmark. Coins minted at the San Francisco Mint will have an "S" below the units digit of the date. Coins minted at the Denver Mint will have a "D" below the units digit of the date. Australian Threepences minted from 1947 to 1964 were minted at the Melbourne Mint and have no mintmark. Some Australian Threepences minted in 1951 were minted at the Royal Mint London. The mintmark is "PL". The "P" appears above the first "E" in "THREE", the "L" appears above the "E" in "PENCE".
From its initial issue in 1910, until 1915 inclusive, the Australian Shilling was minted at the Royal Mint London and has no mintmark. Some of the 1915 issue of the Australian Shilling were minted at the Heaton Mint in Birmingham and have a mintmark "H". From 1916 to 1926 inclusive, the Australian Shilling was minted at either the Royal Australian Mint Melbourne or Sydney. Coins minted at the Melbourne Mint have a mintmark "M", coins minted at the Sydney have no mintmark. With a few exceptions, from 1927 to the last minting in 1963, the Australian Shilling was minted at the Royal Australian Mint Melbourne. Coins minted at the Melbourne Mint have a mintmark "M" if they have a mintmark at all. From 1942 until 1946 inclusive, Australian Shillings not minted at the Melbourne Mint exclusively, were minted in addition to the Melbourne coins at the following Mints - 1942 - San Francisco Mint "S" 1943 - San Francisco Mint "S" 1944 - San Francisco Mint "S" 1946 - Perth Mint - small dot (.) before the "S" in "SHILLING" (.SHILLING)
British Edward VII (1902-1910) Sovereigns and Half-Sovereigns were minted at the Royal Mint London, Ottawa, Melbourne, Perth and Sydney Mints. The coins minted in London have no mintmark. The Sovereign and Half-Sovereign coins minted elsewhere have a mintmark "on the ground" below the horse and above the date. The coins minted in Ottawa have a mintmark "C". The coins minted in Melbourne have a mintmark "M". The coins minted in Perth have a mintmark "P". The coins minted in Sydney have a mintmark "S". The letters BP to the right of the date is the designers initials (Benedetto Pistrucci) who designed the St George and the Dragon scene.
From its initial issue in 1910, until 1915 inclusive, the Australian Threepence was minted at the Royal Mint London and has no mintmark. From 1916 to 1926 inclusive, the Australian Threepence was minted at either the Royal Australian Mint Melbourne or Sydney. Coins minted at the Melbourne Mint have a mintmark "M", coins minted at the Sydney have no mintmark. With a few exceptions, from 1927 to the last minting in 1964, the Australian Threepence was minted at the Royal Australian Mint Melbourne. Coins minted at the Melbourne Mint have a mintmark "M" if they have a mintmark at all. From 1942 until 1951 inclusive, Australian Threepences not minted at the Melbourne Mint exclusively, were minted in addition to the Melbourne coins at the following Mints - 1942 - San Francisco Mint "S", Denver Mint "D" 1943 - San Francisco Mint "S", Denver Mint "D" 1944 - San Francisco Mint "S" 1951 - London Mint "PL"
Any 1942, 1943 or 1944 Australian Threepence, will have the "S" (San Francisco) or "D" (Denver) mintmark on the reverse of the coin, on the right hand side, just below the fourth digit of the year. Any coins minted in Melbourne will have no mintmark.
The 1944 Australian Penny was minted at one of two mints. Melbourne Mint (no mintmark - 2.45 million minted. Perth Mint (mintmark = Y.) - 27.83 million minted.
An Australian 1942 Halfpenny minted in Melbourne, has no mintmark. An Australian 1942 Halfpenny minted in Perth has a dot (.) after the (Y) in PENNY (PENNY.). An Australian 1942 Halfpenny minted in Bombay has an (I) below the King's head.
It would depend on the Florin of which country you refer to. The Florins of most British Empire countries were minted at only one mint in 1944, therefore a mintmark was not used. The 1944 Australian Florin was minted both at the Melbourne Mint and the San Francisco Mint. Those minted at the Melbourne Mint have no mintmark. Those minted at the San Francisco Mint have a small "S" above the date and below the Coat of Arms.
There were 22,380,000 1910 Sovereigns minted at the Royal Mint London (no mintmark), plus a possible further 10 million minted at the Melbourne, Perth and Sydney Mints (mintmarks M, P and S respectively).
There were about 10,041,000 British 1904 Sovereigns minted at the Royal Mint London (no mintmark). There were about 3,743,000 British 1904 Sovereigns minted at the Melbourne Mint (mintmark = M to the right of the date). There were about 4,506,000 British 1904 Sovereigns minted at the Perth Mint (mintmark = P to the right of the date). There were about 2,986,000 British 1904 Sovereigns minted at the Sydney Mint (mintmark = S to the right of the date).
Australian Pennies from 1955 to 1964 inclusive were minted at either or both of the Melbourne Mint and the Perth Mint. Pennies minted at the Melbourne Mint have no mintmark. 1956 Pennies minted at the Perth Mint can be identified by a dot "." after the "Y" in PENNY, eg. "PENNY.".