Doesn't look natural to me. To have the toning be so concentrated on the raised portion of the obverse with nothing in the fields seems odd. John
I agree with others. Toning looks odd. I had a coin I left in Canphor vasoline that turned out just like that. The other stuff in the petrolem (additives) did it I think. Have torched coin just to learn and they looked like that too early in the process. Maybe it sat on top of an appliance (refrigerator) and heated up unevenly?