Worn and corroded agitator shaft
That shaft is not in good enough condition for a long lasting rebuild job.
We have certainly seen ones in worse condition.
I would try filling pits with epoxy and then put an epoxy finish on the shaft a machine shop could make it look great again, but it has to have a corrosion proof finish on it to be a lasting repair. Otherwise it will just corrode and tear up the new seal. It cannot just be a plain steel shaft.
You could all so have it repaired at a machine shop and then have it nickel plated, however, Maytag used more of a epoxy coating in the later years on these shafts.
John L