What breed is this? Campine, Yokohama, cross?

[Devro93]

I am fairly new to raising chickens and am wondering if I'm correct in assuming this is a Campine-Yokohama cross.
I bought 6 campines as chicks (5 looked purebred, but this guy was clearly not). I did buy a Yokohama chicken from the same seller, which is why I assume the cross, but I have recently seen photos of silver duckwing old English game hens, and I'm not so sure about my assumption anymore.

 

[NatJ]

I wonder if it is a purebred Campine, but without the hen feathering?

Campines have a form of hen feathering, so the males do not usually grow the tail & saddle feathers like what yours is showing.

Hen feathering also affects the coloring. With hen feathering, the males and females have the same coloring and pattern. Without hen feathering, males would have a different pattern of color than the hens do-- similar to what yours is showing.
https://www.feathersite.com/Poultry/CGD/Hamb/BRKHamburg.html
This page has a photo (scroll down a ways) of a pair of Silver Penciled Hamburgs. The hen pattern is very similar to what Campines have, but the rooster looks quite a lot like the one you have. Hamburgs do not have hen feathering, so that is about what would happen if you got a Campine without the hen feathering.

Edit: I forgot to look at the comb. Campines should just have single combs, and yours doesn't look quite right. So he probably is a mix of some sort after all, unless he lost the tips of his comb to frostbite or some other kind of injury.