I don't know of any 1917s that were manufactured in .45 Colt, but I suppose one could have been converted. Speculation only: don't put any weight on my ignorance and guesses.
A possibility to consider is that this is a .455 HE, Second Model that was converted from .455 Mark II to .45 Colt after the war. I have one of these.
You should be able to tell them apart by the barrel length. A .455 would have a 6.5" barrel, a 1917 5.5". Also the .455 is likelier than not to have British proof marks all over it.
For those who don't know why I am proposing this, the 1917 and the .455/Second both have unshrouded ejector rods. At a glance they look similar; an unwary seller may have misidentified what he is offering.
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David Wilson
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