Repunched date Aussie threepence

While looking through an album today, I spotted this 1924 Australian 3 pence with a repunched 4 in the date. There's a fair amount of separation between the two punches. Is this something that's harder to find, or are repunched digits a fairly common occurrence with this series?





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WTB an error forum!
It doesn't mention 1924 much but says "As 1924 was the first year in which the Melbourne Branch of the Royal Mint altered the date on a matrix from a master punch it follows that any die for an alleged 'over-dated' 1922 coin must have been made by the Royal Mint, London"
Also says "Officially sanctioned re-dating didn't begin until late 1923 in preparation for striking coins for 1924 because the Royal mint sent fully-dated 1923 tools to Melbourne in late 1922...."
Didn't have time to reread the article this morning but hope this helps. It also says that fewer that 1000 of the 1922/1 overdate threepence exist.
Andrew