Has the blade been sanded? It might just be my monitor, but it looks to have plenty of odd marks from sanding all over it, plus what looks like a fair bit of pitting.
Mind you, I am sensitive to pitting - even so-called 'water marks' are a form of light pitting to me, as evidenced by the shallow depression revealed when looking at them under the right lighting conditions.
If there are light scratching/sanding marks on the blade, any patina that took years to build up disappeared at the time those marks were made.
Regards,
Neil