I agree,......looks to be textbook diffused caramel corn in my opinion. They can also have color "bleed" on the ventrals, or be plain, but not the typical pronounced checkering of other corns. They start out life just as you described too, then gradually change into the phenotype you have.
~Doug
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"a snake in the grass is a GOOD thing" 

serpentinespecialties.webs.com

