It's smooth mostly all around you can see where the thread maker went off track filled in D weighs 5.42gr
We need to see the whole coin, both sides. They are called reeds, not threads, and the "thread maker" is the collar, and it's impossible for it to go "off track" in the way you seem to be thinking that it works. It might be a clipped planchet but nobody can say from only seeing parts of the coin. Edit: multiple threads about the same coin. From your other images it's just badly damaged.
Altered quarter. Not a mint error of any kind unfortunately. Here is some information on Reeded edge.. Reeding - Wikipedia https://share.google/YxRhjOJBLOb1fLvDJ
