Not mine, so I couldn’t possibly care less, but a simple google arrives at this:

Over the past few years a limited number of breeders have advertised and sold dogs they represent to be purebred Labrador Retrievers with a dilute or gray coat color—hence the term “silver labs.” The AKC has accepted some of these “silver labs” for registration. Apparently, the rationale for this decision is that the silver coat color is a shade of chocolate