This is Ugly White and one of the Reds that remain as breeders. I'm down to "just" ten Roos; Ugly White, another Black and..., the remaining male birds are all variations on Red - one of which is Mahogany.
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Ugly White deserves his name, but that blotchy pattern is well on it's way to good camouflage.
I am VERY much a beginner in re: patterns, but I wonder if he carries lacing? You have/had SLW hens, right?