Congratulations on another save & restore.
Hoo-boy there sure was a lot of icky poo in that washer. I think the reason those center-post lint filters tend to get full like that is, people don't bother to read the manual and find out they have to clean it out after each load.
So, what exactly is that agitator? Is that a flexible contoured rubber disc over a plastic molding? And what's all the dark crud at the bottom (or should I ask?), did it come off without too much scrubbing?
The mechanism with the pressed steel bottom and the accessible belt is clever as heck, must make it relatively easy to change a belt.
What are you going to do to repaint the cabinet where all that rust is near the top?
(How it is that people don't clean their appliances, or their houses for God's sake!, is beyond me. My place can get to looking like an industrial workshop with piles of geek-junque all over, but at least it's clean in the sense of being sanitary and free of health hazards. A few times in my life I've seen houses that looked like they badly needed to be dunked in bleach just to disinfect. Ick.)