Yep, looks like it was bent and straightened. Shame...
Also looks like it could be wootz. Could this bending be a result of a genuine battle damage?
I too have a sosun pattah in my collection (northern form) with thin double fullers running 3/4 of blade's length. I'll have to go through my old pictures to find a couple that I can share.
Archer: I would advise you against attempting to straighten the blade or urge to at least be VERY careful. Based on your 2nd set of pictures, I can see cracks forming at the points of bending. Chances are that any tempering with these areas may cause additional damage.