I regret to say that I agree with those who indicate they feel this pistol has been refinished.
To the best of my knowledge, all Colt Government Model pistols (i.e.commercial production) produced at that time in standard blued configuration (as were all of the 5,000 purchased by Canada in 1914) had a highly polished finish and very rich "carbonia bluing" .... neither of which seem evident in the photos of your relative's pistol, unfortunately ....
I am the proud custodian of a very nice pistol from the 1914 Canadian purchase, in excellent original condition. This photo hopefully demonstrates what I am saying about the finish - what appears to be streaking or "mottling" (most noticeable on the slide) is in fact the reflection of tree branches .... the photo having been taken outside on a 'cloudy-bright' late fall day -