I can tell you this house has done a lot of settling over the years. I have seen that in the plaster walls that I have had to repair.
I am also about 150-200 yards away from train tracks. When those trains go by loaded with coal the house shakes. I wish I could get one of those train cars to stop and drop off 40 ton of coal.
I have taken 4 videos of the chimney. I am not to pleased with what I have noticed but I will let you be the judge. The crack begins in the basement and seems less and less as I get higher.
The first two videos are in the basement are different sides of the chimney.
The second on the first floor.
The third on the second floor.
The chimney sticking out the roof looks brand new with fresh mortar.