The C broadarrow was officially removed in 48/49, although it was applied when manufacturers followed the drawings for some time yet, right into the late 60s on items like the KFS.
The stylized arrow(or is it a maple leaf...I think it's and arrow) with the inspection services mark came in around 1950 from the equipment that I have seen, and was gone by the early 70s. The alpha/numbers in the stamp are likely the individual inspectors assigned number.
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