Trying to figure out what kind of duck he is, was sold to me at 2 days old as a pekin, deffintly not a pekin.
My WH used to stand like that a lot when they were younger, not any more. I think the large size of the collar has more to do with it not being to breed standard. I think most breeds that have it are supposed to have a thin, uniform white band, but that's just based on pictures. I don't know all the breed standards by any means.
It could be a Runner but it doesn't seem slender enough to me. Does is walk around upright? If it almost always walking around like that then it would be a Runner. If it is a Runner, it could be a Trout Runner. They have very similar markings to WH.