Rare coins: An extremely rare 50c coin worth $15,000 is circulating in Australia | news.com.au — Australia's leading news site
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Amateur code breakers challenged to decipher secret messages on Australian coin | Australia news | The Guardian
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Australia: Commemorative coins celebrate 50 years of the introduction of iconic 12-sided 50-cent coin — World Mint News Blog
Can you crack it: Limited-edition 50 cent coin released by Australia's secret intelligence agency contains a hidden code | Sky News Australia
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