This genuine leadlight fitting is very old. I have personally owned it since the early 2000's and it was old then.
It's def got some signs of age - the lead is a bit soft here and there (probz as it hasn't been hung up in recent years and has been sitting on its base) so some of the panels are not super straight. I think a skilled person could fix this easily, or even a psycho with a hot glue gun.
You can see the side bottom is slanting in a bit in the second photo.