There are three color groups for all labs, "British" or "American" some make this distinction based upon breeding history most just make up this crap and call them British if they are short smaller dogs, which was typically what the British breed; while the American version is the 100lb lab most hunters have today.
The three color groups are Black, (which is the most dominate color), chocolate, and yellow. Those three are the only colors to assign to your dog when registering with either CKC or AKC. Some people who have breed silver labs for a long time argue that there should be a 4th color, genetically it's just not there. Even two silver labs breed together throw chocolates; proving that there is not true silver gene (it would be recessive so you'd have to breed silver to silver and silver to silver and silver to silver to actually get true genetic results, but it's been done and proven to not happen.
Most silvers, and I've seen a ton (worked in a vets office and been around labs most of my life), look a hell of a lot like weiminers, these dogs don't which imo is a good thing. More than likely when if you were to buy one of these you would need to find a dudley chocolate or dudley yellow to breed to, to have any hopes of having any silvers (dudleys are completely rescessive for their color, usually showcased in chocolates by having highlighted feathering on the back legs, eyebrows and a liver or redish nose instead of a black nose. Yellow dudley's will have a liver nose not black.
These dogs really aren't all that much more($$$) than good hunting stock normal labs, for the owner to also offer OFA is a damn good deal at 800-900 bucks.
