An Australian Five Dollar coin will most likely be made from an aluminium-bronze alloy, giving it a gold appeaance.
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.
Numismedia lists an approximate retail value as of 07/2009 of $250 for a 1972 double-die cent in circulated condition. Uncirculated ones exceed $400.
$50-$150, depending on condition. Most were low dollar guns.
Blue Book of Gun Values will help.
Depending on the Firearms condition, price could go from about $100.00 to around $300.00
$125 or so- depending how poor the condition. These were imported by H & D Folsom Sporting Goods, and were not high dollar guns. There is not a major collector interest.
A 1914 double eagle in circulated condition has retail values of $1,420.00-$1,890.00 depending on the grade of the coin
The "double bar" refers to two lines appearing to stick out horizontally from the back of the emus head. They are actually a part of the reed design. The fault is most pronounced on the 1979 and 1980 50 cent coins and to a lesser degree on the 1966 (round) coin. It was a weak spot on the dies and caused early fractures in the coins. The offending part of the design was subsequently ground out of the dies and is not visible in later coins. An Australian 1979 50 cent coin (Double Bar fault), uncirculated and in absolute mint condition could fetch up to $12 AUD. An Australian 1979 50 cent coin (Double Bar fault)(Proof), uncirculated and in absolute mint condition could fetch up to $100 AUD. An Australian 1980 50 cent coin (Double Bar fault), circulated but still in good condition, might fetch anything up to $4 AUD. A reputable coin dealer will be able to give a more accurate valuation.
Without more information like model number serial number, and overall condition I can only give you an approximate value. In like new condition, around $900.00, in very good condition, around $500.00, in good condition, around $300.00 and in poor condition, around $100.00.
About $6 in average circulated condition, and about $12 in uncirculated (as new) condition. If it is a star note (with a star at the end of the serial number in place of a letter), you can double these values.
The coins are really only worth face value, but in uncirculated condition, they might go for as much as double that.
Its is strange but true, a rare condition where a child is born with two vagina's or uterus. 27 year old Australian, Hazel Jones, was born with double vaginas, cervixes and uteruses.
Typically for lower denominations in average condition, you can double the face value of a silver certificate and this is your real value. However, be aware that condition, star notes and low/high serial numbers can add significant value.