Good information, Alan. Thank you.

I worded my post badly. I did not mean to imply that I thought Colt was supplying the NS in .455 to anyone in 1940, or that they had any on hand. I certainly don't know that. I should have said something like "it was available" in that caliber, meaning revolvers could be ordered so chambered, according to the Shooter's Bible.

Just in general, it seems the Canadians were quite satisfied with Colt's New Service. One last quote from Revolvers of the British Services that I hope some here will find interesting:
"Canada had purchased 940 Colt "New Service" revolvers in nominal calibre .455 Eley for its troops going to the Anglo-Boer War in 1900. Canada purchased more such revolvers for its Royal North-West Mounted Police in 1904. Further purchases of this model revolver occurred both before and after the R.N.W.M.P. became the Royal Canadian Mounted Police in 1920, and a number of such arms were delivered in calibre .45 Colt."

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