Yes, this is a Hanging 3. This is a good example of classical die clash we can find on many 50's and 60's Canadian 1 Cent. There's many variations of Hanging number.
The "Hanging" is the small curved line above the 3. This is a result of clashed dies when no planchet is present during the mint process. The small line is the signature of Queen's throat. You can find more information on die clash here: https://www.coinsandcanada.com/coin...-clash&id=10
This link gives also some examples on Canadian coins.
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