From Wikipedia
"In 1850, the Bank of Upper Canada received the right to issue a coinage due to a severe coin shortage. The coinage consisted of 1/2 Penny and 1 Penny Bank Tokens. The obverse of the coins carried a representation of St.George slaying the dragon based on Benedetto Pistrucci's gold sovereign coinage design. The reverse of the coins carried the then obsolete Coat-of-Arms of Upper Canada. The 1850 issue was struck at
The Royal Mint, London, but the coins did not arrive in Canada until 1851. In 1857, Heaton's Mint were asked to strike this final coinage. The reason why this was the final coinage was, because the introduction of a decimal currency into Canada was being contemplated.The coins of Upper Canada are very popular with collectors of British Empire coins, not only those of Canada. There are a few scarce pieces in this series. The 1857 issue is quite difficult to find. The pieces have been given the affectionate nickname of "St. George Pieces", because of the obverse design.
In 1863, the Bank of Upper Canada complained to the Canadian government that it had a hard time trying to issue their final coinage because of the change to decimal currency. The government bought the coins and stored them in a warehouse as copper bullion. After Canadian Confederation, a proportion of the coins managed to reach circulation, but the majority of the coins were melted in 1873 under government supervision."
You have a very nice addition to your collection regardless of whether there is a die-crack or not. May I ask how much you paid for it? I have a 1/2 penny Bank Token from Lower Canada (present day Quebec) issued in 1837 and not in quite as good condition as yours. Enjoy!