Do people call these two tone sunbursts? My '60, and this one too, look like a 3 tone sunburst with a very wide gradation. I see red in there. When I hear two tone, I think early Strat.
I don't think the sides are bursted, I believe they looked uniformly dark when new but this type of burst fades in an irregular way. The light areas are where there is less overlap in the spray pattern.