The Australian 1954 Florin (Two Shillings)(Royal Visit Commemorative), was minted only as a 50% silver coin. There is no evidence suggesting that the coin was ever produced in gold.
If you have a gold coin, it is because somebody had it plated. Modified coins have no value.
If you refer to the collector value of 1954 Australian coins, not much. Any value would be dependent on the condition of the coins.
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.
An Australian 1946 50% silver Florin (Two Shillings)(George VI), uncirculated and in absolute mint condition could fetch up to $70 AUD. If it has been circulated but still in good condition, it might fetch anything from $4 to $18 AUD. There were 23.222 million minted. A reputable coin dealer will be able to give a more accurate valuation.
I presume you refer to the Australian Florin which seems to be the only 1954 Florin (2 Shilling) that is significantly different from the rest. It is a Commemorative coin issued for the Royal Visit to Australia by Queen Elizabeth II, and was minted in Melbourne. Its composition is 50% silver, 40% copper, 5% zinc, 5% nickel, the same as all Australian Florins from 1938 onwards. The obverse is the same design for the period, featuring a youthful Queen Elizabeth II, designed by Mary Gillick. The reverse is the only significant difference featuring a "British Lion" and an "Australian Kangaroo" standing side by side, with "Australian Florin" around the top, and the year "1954" at the bottom, and designed by William Leslie Bowles. An Australian 1954 Florin, uncirculated and in absolute mint condition could fetch up to $50 AUD. If it has been circulated but still in good condition, it might fetch anything from $3.50 to $12 AUD. There were 2 million minted. A reputable coin dealer will be able to give a more accurate valuation.
There were no New Zealand Florin coins minted from 1954 to 1960 inclusive. There were no New Zealand Halfcrown coins minted from 1954 to 1960 inclusive.
There is no Australian 1954 20 cent coin. Decimal currency was introduced in 1966.
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.
Such a coin does not exist. There were no New Zealand Florins (Two Shillings) minted from 1954 to 1960 inclusive.
3-10 cents, depending on condition.
Such a coin does not exist. Dollars and cents were introduced into the Australian currency on the 14th of February, 1966.
Depends on condition. Range from 300-800
Made in 1954. Depending on condition $400-$1200