Note I have not verified but look like good info..
https://www.backyardchickens.com/articles/naked-necks-3.53079/
Well, your version of a "good" hatchery.. doesn't breed for specific colors as far as I can tell.. no rudeness intended.
Another source describing the standard..
https://sites.google.com/site/tasrarepoultryclub/rarebreedprofiles/naked-neck-profile
I haven't yet purchased my own copy and find it pricey but the APA standard of perfections book can be bought at their website..
http://amerpoultryassn.com/
As I suggested find some breeders club sites and see sometimes they get listed for free.. but what I've posted probably contains the jest of it.
