Makes plenty of sense to me. I read the AVIANDIV page on Icelandics a few days ago and that's what it looked like. It said that other breeds were introduced to the population between 1900 and 1950, which lines up with the fact that they observed the occasional trait that should not be present in "pure" icelandics, such as beards and brown eggs. The lines imported to the US are, according to conservationists, descendants of the only pure remaining flocks, though that's unverifiable to my knowledge. This definitely makes me feel less guilty about my plans to mix them with other breeds, corrupting this rare genetic treasure
They're still good flock candidates in my book, the local populations are more diverse than either fayoumis or sumatras, which are both praised for their strong genetics.
Another thing that SYNBREED taught me is how much of a mess sebrights are, they're kind of just little bundles of recessive traits in the vague shape of chickens. It kind of makes sense; they're one of the earliest officially standardized breeds, so they've been linebred for a very long time.
