If the date of the movie is correct, then it narrows down a question I have had about when the upper right shield was removed from the Canadian guns. They came with them, but in the 1963 manual, photos show the guns without that shield. Your movie, if the date is correct, also show that shield removed. Apparently the upper right shield did not stay on the guns very long in Cdn service, since the guns were built from about 1955 to 1957.
I suspect it was due to fouling the panoramic sight and mount. I was lucky in that I did find one upper right shield at the local scrapyard for my C1.
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