My Svarthona are among my favorite birds but realistically, I think you're getting in the profit game a little late. Just like Crested Cream Legbar a few years back (and whatever the flavor of the month was before that and so on...) You essentially need to be the guy who has the first couple...
It wouldn't surprise me. S/he has done everything s/he can to die: saddle air cell, positioned funky in the egg, pipped in weird spot, shrink wrapped, curled toes, pasty butt - to date... A complete pain in the *** really, but what can you do? ;)
Pullet? I know she has some white toenails, but she's what I have and currently not interested in buying a new set of eggs or chicks (getting a dozen Horstman barred rocks in the a.m.) so she'll be my starter hen and we'll see how it goes...
Assuming this is a cockerel from the comb variance...