In 2000, more than 16 million commemorative Millennium 50 cent coins were issued for circulation. While not mint fault, the incuse version of the Millennium 50 cent coin is still valuable. Value: approximately $100 2000 incuse flag Millennium 50 cent coin Multiple batches of the 2001 Federation $1 contain the upset error with the QueenвЂ™s head struck sideways and upside down on different coins. 2001 federation upset errorДЄn вЂupset errorвЂ™ occurs when the Queens head side of the coin is rotated instead of the same upright position as the other side of the coin. This means the heads stamp is slightly smaller than usual, giving it double rings around the edges. In 2000 a batch of $1 coins were accidentally stamped with the head from a 10c coin. 2000 mule variation double ringed $1 coin Rabbit ears $1 coinДЄ common mistake on the tails side of a $1 coin can lead to the top kangaroo appearing to have rabbit ears. This coin from 2007 was incorrectly minted with the QueenвЂ™s head on both sides. While youвЂ™re unlikely to come across a 1930 proof penny in your loose change, many currently circulating coins contain errors or faults made during the minting process which can make them valuable to numismatists (coin collectors).ДЇaults include incorrect alignment, the use of mismatched dies (known as mules), missing dates and strike errors.Д¬heck your loose change drawer for these minting faults that could earn you a nice chunk of change. Only six proof versions of the 1930 penny are known to exist: three have private owners, one in the Museum of Victoria, the National Gallery of South Australia and the British Museum. AustraliaвЂ™s rarest coin, the 1930 penny proof, sold for $225,000 in 1998.

Value of coins by year