I'm guessing it's what's called a Yellow Head Albino. The head (obviously lol), the yellow or peach 'edging' around the pattern, and general high contrast look are all part of the trait. VPI had/has them, Ralph Davis had one, and I'm seen photos and videos of them in Europe.
Maybe it's one additional gene, but it's more likely to be a polygenic trait, as there appear to be different degrees of Yellow Head expression. They can get pretty cool looking. It is a BP trait, not something boosted from Retics
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