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If you are suggesting that you have an Australian 20 cent coin with the same image on both sides, there is almost no chance this could occur with modern minting processes.

Nothing is impossible, but because of the way the dies are fitted together, one side of the coin would have to be incuse, or the image indented into the coin rather than raised. This can be caused by the previously struck coin not being ejected from the die before the new blank was inserted and the incuse image being the result of the new blank being struck against and already struck coin. Coins mistruck in this manner are unlikely to get past the quality control and into circulation.

Most likely, you have a trick or novelty coin sold by magic shops.

Any coin with a "genuine" minting flaw would have some value, above the usual, as a collectible coin.

Genuinely flawed coins are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the minting process, and have escaped detection during quality control at the mint therefore, a valuation cannot be anticipated.

A reputable coin dealer should be able to identify and confirm the coin as genuine and make a valuation.

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An Australian 1930 Penny is the rarest coin that has ever been released into general circulation in Australian history. Only 3,000 were minted and of those, 1,500 still exist and are trading in todays market. They are still arguing about why the 1930 Penny was released at all.

There are only 6 proof coins known to exist, 3 in museums and 3 in private collections.

Depending on who you choose to believe, a proof 1930 Penny might go for anything between $250,000 and $500,000 AUD. One of the private collectors has recently declined an offer of $1,000,000 AUD for his proof coin. Another has accepted a $650,000 AUD offer.

An Australian 1930 bronze Penny (George V), uncirculated and in absolute mint condition could fetch up to $275,000 AUD. If it is in less than mint condition, it might fetch as little as $18,500 AUD.

A reputable coin dealer will be able to give a more accurate valuation.

Authentication and verification of such coins is vital. There have been replica coins, as distinct from forgeries, made. Any replica coin should have some indication on it that it is a replica.

The Australian 1930 Penny has recently been described as the "Holy Grail" of the coin collecting world.

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The last Australian Penny was minted in 1964.

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9999

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An Australian 1939 Sixpence, uncirculated and in absolute mint condition could fetch up to $475 AUD. If it has been rattling around in somebody's pocket but still in good condition, it might fetch anything from $3 to $85 AUD. There were 1.6 million minted. A reputable coin dealer will be able to give a more accurate valuation.

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These coins are potentially still in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 20 cents.

An Australian 1967 cupro-nickel 20 cent coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to $35 AUD.

There were 83.847 million minted.

A reputable coin dealer will be able to give a more accurate valuation.

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One each of the 5, 10, 20 and 50 cent, 1 Dollar and 2 Dollar coins = 50.95 grams.

Australian coins have the following weights -

1 cent - 2.59 grams

2 cent - 5.18 grams

5 cent - 2.83 grams

10 cent - 5.66 grams

20 cent - 11.31 grams

50 cent - 15.55 grams

1 Dollar - 9 grams

2 Dollar - 6.6 grams

The 1 and 2 cent coins are still legal tender.

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A British 1921 Maundy (silver) Penny, uncirculated and in absolute mint condition could fetch up to £15 GBP. If it has been circulated but still in good condition, it might fetch up to £8 GBP. A reputable coin dealer will be able to give a more accurate valuation.

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In view of their minimal purchasing power, the Australian 1 and 2 cent coins had became virtually worthless and considering their value, they were relatively expensive to make.

The last Australian 1 cent coins were put into general circulation in 1990 and the last 2 cent coins were put into general circulation in 1989. They were both progressively withdrawn from circulation in 1994 and all prices rounded off to the nearest 5 cents.

The Australian 1 and 2 cent coins have not been de-monetised and are still considered to be legal tender and can be deposited in banks.

According to the Australian Currency Act of 1965, 1 and 2 cent coins are legal tender if, when submitted for payment, they do not exceed a combined value of 20 cents. There may be problems in getting a business to accept them however.

The one cent coin was minted for "Mint Packs" only in 1991.

The two cent coin was minted for "Mint Packs" only in 1990 and 1991.

The only decimal copper coins used in Australia were the one and two cent coins.

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There were three types of Australian Sydney 2000 Olympic Games coin issue. A 28 coin bronze set, a 16 coin silver set and an 8 coin gold set.

The Five Dollar bronze coins might fetch anything from $10 to $12 AUD each.

There were 100,000 minted.

The Five Dollar silver coins might fetch anything up to $55 AUD each.

There were 100,000 minted.

The One Hundred Dollar gold coins might fetch anything up to $550 AUD each.

There were 30,000 minted.

A reputable coin dealer will be able to give a more accurate valuation.

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An Australian 2000 gold Proof Sydney 2000 Olympics coin 4 set, in absolute mint condition and the original packaging, could fetch up to $1,760 AUD.

There were 3,000 sets issued.

An Australian 2000 gold Proof Sydney 2000 Olympics coin 8 set, in absolute mint condition and the original packaging, could fetch up to $3,595 AUD.

A reputable coin dealer will be able to give a more accurate valuation.

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The Royal Australian Mint (RAM) uses a variety of "fonts" on Australian coins, but the information is confidential so as not to make it any easier for counterfeiters.

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Australian decimal coins were first issued on the 14th of February, 1966, and general circulation coins have the following specifications -

1 cent coin (withdrawn from circulation in 1994) - has a coppery appearance, weighs 2.59 grams, is 17.53 mm in diameter, has a plain edge and is made from 97% copper, 2.5% zinc and 0.5% tin.

2 cent coin (withdrawn from circulation in 1994) - has a coppery appearance, weighs 5.18 grams, is 21.59 mm in diameter, has a plain edge and is made from 97% copper, 2.5% zinc and 0.5% tin.

5 cent coin - has a silvery appearance, weighs 2.83 grams, is 19.41 mm in diameter, is 1.3 mm thick, has a reeded edge and is made from 75% copper and 25% nickel.

10 cent coin - has a silvery appearance, weighs 5.66 grams, is 23.60 mm in diameter, is 2 mm thick, has a reeded edge and is made from 75% copper and 25% nickel.

20 cent coin - has a silvery appearance, weighs 11.31 grams, is 28.52 mm in diameter, is 2.5 mm thick, has a reeded edge and is made from 75% copper and 25% nickel. Occasionally used as a Commemorative.

50 cent coin (1966 only - withdrawn from circulation in 1967) - weighs 13.28 grams, is 31.50 mm in diameter, is 3 mm thick, was round with a reeded edge and is made from 80% silver and 20% copper.

50 cent coin (from 1969) - has a silvery appearance, weighs 15.55 grams and was 31.51 mm in diameter, is 3 mm thick, is dodecagonal (12 sided) with a plain edge and is made from 75% copper and 25% nickel. Frequently used as a Commemorative.

One Dollar coin - (introduced in 1984) - has a gold appearance, weighs 9 grams, is 25 mm in diameter, is 3 mm thick, has an interrupted reeded edge and is made from 92% copper, 6% aluminum and 2% nickel. Frequently used as a Commemorative.

Two Dollar coin - (introduced in 1988) - has a gold appearance, weighs 6.6 grams, is 20.62 mm in diameter, is 3.2 mm thick, has an interrupted reeded edge and is made from 92% copper, 6% aluminum and 2% nickel.

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An Australian 1913 sterling silver Shilling (George V), uncirculated and in absolute mint condition could fetch up to $4,900 AUD. If it has been circulated but still in good condition, it might fetch anything from $25 to $725 AUD.

There were 1.2 million minted.

A reputable coin dealer will be able to give a more accurate valuation.

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An Australian 1992 Five Dollar note (Fraser/Cole)(medium to dark green serial AA81), uncirculated and in absolute mint condition could fetch anything up to $40 AUD. If it has been circulated but still in good condition, it might fetch anything from $6 to $16 AUD.

An Australian 1992 Five Dollar note (Fraser/Cole)(pale green serial AA81), uncirculated and in absolute mint condition could fetch anything up to $100 AUD. If it has been circulated but still in good condition, it might fetch anything from $9 to $30 AUD.

1992 was the first issue of the revised polymer banknote manufacturing process.

A reputable coin dealer will be able to give a more accurate valuation.

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There are no rare Australian Fifty Dollar notes. The closest you might get to a rare note is the first or last of a series. The serial number containing all consecutive zeroes or nines.

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What are commonly referred to as gold coins in Australia are the general circulation One and Two Dollar coins. Neither has any gold in them, but they do have a dirty gold appearance. Both coins are made from an alloy of 92% copper, 6% aluminium and 2% nickel.

Both the Royal Australian Mint (RAM) and the Perth Mint produce a range of Proof coins, nuggets and other coin like objects for collectors and investors which do have a gold content of between 91.67% and 99%.

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Australia puts famous or historically significant Australian identities on its banknotes.

The original paper One Hundred Dollar note released between 1984 and 1996, had Sir Douglas Mawson (Antarctic Explorer and Professor of Geology) on the front, and John Tebbutt (Pioneer of Australian Astronomy and discoverer of several comets) on the back.

They were progressively withdrawn from circulation in favour of the polymer notes from 1996.

The new polymer One Hundred Dollar note released from 1996 onwards, has Dame Nellie Melba (born Helen Porter Mitchell)(World renowned Soprano) on the front, and Sir John Monash (WW1 General, engineer and administrator) on the back.

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Five dollars

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An Australian 1943 bronze Penny (George VI)(minted in Melbourne - no mintmark), uncirculated and in absolute mint condition could fetch up to $120 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $30 AUD.

There were 11.107 million minted.

An Australian 1943 bronze Penny (George VI)(minted in Perth - mintmark = "Y."), uncirculated and in absolute mint condition could fetch up to $115 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $28 AUD.

There were 33.086 million minted.

An Australian 1943 bronze Penny (George VI)(Proof)(minted in Perth - mintmark = "Y."), uncirculated and in absolute mint condition could fetch up to $40,000 AUD.

An Australian 1943 bronze Penny (George VI)(minted in Bombay - mintmark = "I"), uncirculated and in absolute mint condition could fetch up to $135 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $30 AUD.

There were 9.0 million minted.

An Australian 1943 bronze Penny (George VI)(Proof)(minted in Bombay - mintmark = "I"), uncirculated and in absolute mint condition could fetch up to $40,000 AUD.

A reputable coin dealer will be able to give a more accurate valuation.

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The short answer is that the Australian One Dollar note is not rare.

There are a number of types of notes that are highly sought after by collectors.

A "Star" note is a note that has been reprinted after the original note was spoiled during the printing process. The last character of the serial number will be a star. These were printed in 1966, 1967 and 1969 and will begin with the serial prefixes ZAA to ZAQ. For example - ZAD 32165*. The RBA discontinued the practice of "Star" notes as being too expensive and unnecessary.

The first and last in a series, for example - AAA 000000 or AGE 999999, the serial range printed in 1966.

Million numbered notes, for example - DBP 1000000, admittedly these would be rare.

Notes with all numerals the same, for example - DBF 222222 or ACK 555555.

Consecutively numbered groups of 2 or more notes.

Any note with a genuine printing flaw.

Many of these would need to be in mint uncirculated condition to get any great price for them.

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The Australian One Dollar note was withdrawn from circulation from 1984 after it was replaced by the One Dollar coin.

The One Dollar note featured Queen Elizabeth II on the front, and a number of Aboriginal motifs on the back (no faces).

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Please ask one question at a time in the format "What is the value of a 1919 Australian Threepence" for example. Most answers already exist on WA.

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An Australian Penny or Halfpenny with a "Y." (PENNY.) mintmark indicates that the coin was minted at the Perth Mint.

An Australian Penny or Halfpenny with a "I" mintmark indicates that the coin was minted at either the Calcutta or Bombay Mints in India.