Dang, I go on vacation and a super interesting gun pops up.
First off, everyone talking about the defaced serial number; We haven't seen the other side of the frame. I've handled a lot of guns with such modifications to the butt where the serial number was removed. In most cases I have seen the S/N still stamped on the frame somewhere. Presumably by the law savvy modifier who didn't want to run afoul of the G-men. But who knows. With S&W putting the S/N in so many places someone along the past line of owners could have done it.
That said, I have also picked up a number of gunshow guns, removed the stocks, and found the defaced serial number was just not present on the frame at all...
If it isn't on the frame; I do recall someone on the forum here going through the process with the ATF to do it properly and legally and it being remarkably painless. Not sure where that thread is.
As to the gun itself:
As mentioned it does look something like a job that was done to my gun:
Roscoe, the Triple-lock, has arrived
The article in my thread is particularly apropos here I think. There was obviously some line of thought in days past that the rolling action of plowhandle style grips was preferable. At first glance I would say that is what was being attempted here with this 1917.
Personally I think it's glorious. And ridiculous. Which I find very endearing in guns. I'd be one of the masses who would love to own it. Assuming of course that S/N is stamped somewhere on the frame, or that was sorted out with the ATF.
Edit:
Been a long day, just finished a road trip with a 1 year old and a 4 year old. Couple more things:
The front sight is upgraded, would guess maybe something was done to the rear sight too?
The flat screws are interesting on the sideplate. Not sure if the modifier made them, or repurposed them, but at first glance I would have thought that the rear screw at least was a post war flat screw for use with Magna grips, and that the front screw was maybe the same? Except that if my brain is working correctly that screw would be different, and should never have been flat in any model.
In any case, if they are factory screws they may be useful in dating the modification.
Additionally, removing the sideplate may result in further information. I wouldn't be in any way surprised if this gun also has action work done to it. Heck, sometimes people doing modifications like this would engrave their name inside the gun somewhere. Although usually that would be on the frame for ease of access, in at least one case I saw it done on the inside of the sideplate.