I agree the hammer is also incorrect, but looking at it closely convinces me it's a much later part than the pistol...post-1939 short hammer. The hammer isn't "heavy" enough to be an early M1911 part, and the back edge isn't right.
Well, aside from the trigger, my 2-cents says the rear sight looks like a replacement (repo), the magazine sure isn't correct, and the hammer looks modified.
I suppose some of this could be due to the quality and angle of the pics themselves, which is why a hands-on inspection is the only real way to vet the gun. And that's assuming you know what to look for.
Here's my all-original 1918 Colt and the three 'Type 4' mags (i.e., two-tone w/o lanyard loop) that came with it. Mine was examined by a WW1 Colt expert and 1911 collector.
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