Are there any breeds that are "naturally" sex-linked?

[Dr Bjorn Netland]

I wouldn't call jaerhons purebreed.
To your question: all breeds with pure sexlinked barring (cuckoo).

Really not a pure breed? They have been bred in a controlled breeding program since 1916 and thus qualify as purebreds more than most "breeds" listed as standard breeds today. In other words, they are positioned just as well or better than some Dutch breeds (Barnevelders, Welsummers, other?)