Here is mine. His crest and saddle are buff laced with black, as is his breast. Tail & hackles appear to be pure black. There are a few random white feathers in the crest, but nowhere else.
And it turns out he does not have entirely buff wings--it just looks like it when they are folded...
Not common, although I have a similar bird (he is a mixbreed) who has a black body, head & tail and buff wings. Not just the shoulders, the entire wings are an evenly coloured buff. He has some buff lacing on his breast, but is mostly black. Oh, he also has a mostly buff crest--with a couple...