well, i know all about cdn issued ww1 1911's i have had 2 myself, commercial ones, I asked hte seller about it and he said that it was a 455, I asked him to check the barrel because i was well aware that many were converted to 45 ACP, I will have a better idea in a few weeks when i get a look at it.
I tend to think it was an assumption of the seller,but he was pretty convinced it was 455, but i dunno i gave him some things to look for and he has yet to get back to me, it belonged to a friend of his who has passed away and as tol to me has been sitting on a shelf for about 30 years, he has only seen it once,
so we will see i will keep th masses updated, could be a good find could be a great find we will see,
regards,
gavin