There were only three years from 1938 to 1963 in which the Australian Florin (Two Shillings) was minted at a Mint other than the Melbourne Mint.
Some 1942, 1943 and 1944 Florins were minted at the San Francisco Mint. There is a very small "S" mintmark between the 9 and the 4 on these coins.
Florins minted in Melbourne during this period have no mintmark.
Due to an absence of differences on any other Florins, presumably you refer to the Australian 1954 Florin.
The standard issue Australian 1954 Florin has the same reverse as any other Australian Florin from 1938 to 1963. The Australian Coat of Arms with FLORIN above and Australia and the year below.
The Queen Elizabeth II Royal Visit Australian 1954 Florin has the British lion and the Australian kangaroo standing side by side with AUSTRALIA FLORIN above and the year below.
An Australian 1943 Florin (Two Shillings) looks the same as all other Australian Florins from the 1938 to 1945 period.
They have a George VI head on the obverse designed by Thomas H Paget.
The reverse has the relatively new, Australian Coat of Arms design by George Kruger Gray, with the words "FLORIN" around the circumference at the top, "AUSTRALIA" around the bottom, and "1943" just above the "AUSTRALIA".
The composition of the coin is 92.5% silver and 7.5% copper (sterling silver).
It has a reeded edge, weighs 11.31 grams and is 28.5 mm in diameter.
11 million of the 1943 Australian Florins minted were minted at the San Francisco Mint and have an "S" mintmark below the Coat of Arms and above the 1943. All others were minted at the Melbourne Mint and have no mintmark.
Pictures of a specific coin are difficult to come by. Frequently you should be able to find one on eBay, but the picture is withdrawn after the coin is sold.
The Australian 1943 Penny was minted variously at the Melbourne Mint (no mintmark), Perth Mint (mintmark is a dot after the Y in PENNY "Y.") and Bombay Mint (mintmark is an "I" under King George's bust).
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.
The Australian Florin was never minted in gold.
Florin Gabrea was born on April 18, 1943, in Bucharest, Romania.
Florin Codre was born on May 18, 1943, in Brasov, Romania.
Florin Mihailescu was born on July 15, 1943, in Bucharest, Romania.
There were two different types of Australian 1954 Florin minted. The standard type with the Australian Coat of Arms on the reverse, and the Queen Elizabeth II Royal Visit commemorative Florin. The commemorative Florin has the Kangaroo and the Lion, the two animals symbolising Australia and England respectively.
There were no Australian Florins minted until 1910.
You do not specify a denomination or a year. Australian predecimal coins minted at the Royal Mint London prior to 1950, have no mintmark. Australian Halfpennies and Pennies minted at the Calcutta Mint in India in 1916 to 1918 inclusive, have an "I" mintmark below the bottom scroll on the reverse of the coins. Australian Halfpennies and Pennies minted at the Bombay Mint in India in 1942 and 1943, have an "I" mintmark below the head of George VI on the obverse of the coins.
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 Australian 1985 One Dollar coin does not have a mintmark. They were all minted at the Royal Australian Mint Canberra.
No, I have never seen a 1943 Florin stamped into a bottle cap, but I have seen plenty of other coins stamped into bottle caps.