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January 3, 2009
Double Struck Coin Error
Double Struck 1959 Half Penny
An interesting class of coin error is the double struck coin. This type of error occurs when a minted coin is struck again by the coining dies before it has left the coining press completely. This usually results in a partial impression of the coin over the previously struck image. For example, the image above shows a double struck Australian 1959 half penny. On the obverse you can see the remnants of the first strike showing from about 12 o'clock to about 7 o'clock in the area close to the rim. On the reverse you can see the remnants of the first strike from about 4 o'clock to 11 o'clock, again in the area close to the rim.
Below we can see a decimal double strike on a two dollar coin, quite a rare occurance to see one this spectacular. An example like this would probably set you back $1000+
Double Struck 2009 $2
A coin can be struck more than twice, examples do exist of triple and quadruple struck (and even more) coins. It is also interesting to note that modern day proof coins are often struck more than once to give better quality and depth of strike. But of course the coins do not move between strikings so you do not see multiple images of the coins.
Posted by mnemtsas at January 3, 2009 12:25 PM
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