I too have seen a few morgans with that type of toning. Probably album toned, and I believe the ones I have seen have also had a big old fingerprint on them as well.
I think finger oils blocked the toning in the obverse. The recessed areas and those blocked by letters stayed clean so the toned areas oxidized. I think there is a remnant of a print at the front of the neck. Not sure why the rim and reverse didn't tone.
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