Let me know what else I should photograph."That isn't Parkerizing. That's black or grayish. Is it a grey paint? I'll bet the 1917 was a parade rifle for a VFW and they chromed it."
Agreed with the fact that there is some kind of additional coating on the surface. but not with the "parade rifle".
Take a very slow look at the backsight "ears". The profile seems not quite right to me. Flats at the front and top (not clear) where there should be curves. I have a suspicion that these may be welded-on replacements, and the refinishing hides the joint. Bubba strikes again? I hope not.
How about a couple of close-ups of the ears - from the side, front and back, so that we can all form an opinion?
P.S. Also take a look at the foresight. The extra surface was applied over everything, without properly cleaning the metal beforehand, so it has not taken in the pits and the cross-hatching of the foresight ears, block and blade. And the front surface between the ears is just plain tatty. Not a professional job, but another hint in the direction of John Q. Bubba. It doesn't matter who did it - it looks nasty and I would strip it off!
P.P.S. In the very first photo, of the two rifles taken from the right, look at the inside of the front of the left backsight ear. Is that a weld joint?