Well in those year they used like steel I believe and I have a bunch and they are very shiny and I guess missing it is an error eccording to coins Canada and this one is definitely not as shiny as the others I have.
The 1944 and 1945 coins were made of steel, but plated with chrome. The coin in question does appear to be missing the chrome plating, but this is due to wear rather than any type of mint error.