No, I'm pretty sure it's real as in the other pictures of the exterior there is a masonry chimney. If you were just going to have a chase and pipe there would be no exterior square masonry chimney. However I think I can see round stove pipe coming out. Maybe in the beginning 1894 or whatever, it was just masonry with some stove pipe to get it from the stove to the chimney. Then maybe after a few chimney fires they upgraded and put the stove pipe in it? I don't think it would fit? I can't get better pic's of the exterior. He probably figured he could heat up that metal and get more heat out of the stove pipe.
I am including the posting
Heating & Cooling
Fireplace Type
Woodstove
Heating Type
Baseboard heaters, Hot Water, Not known, (Oil), (Wood)
I only see one house chimney, but if he has oil, there must be another chimney.