I read somewhere today that they should be at least 15 degrees off so it looks like yours is in the range. The article also said the greater the rotation the higher the value.
I understand that the obverse could have been the rotated part, but most people seem to call them rotated reverses so that is what I called mine.
It is more than likely that it is the REV that rotated but I don't think anyone can know for sure. Speedy