I'm hoping maybe Stan may know but will welcome answers or opinions from others. This is a spare K D carburetor I bought for my 1917 Maxwell from an AACA member. It surprised me when it arrived because it is nickel plated and has no markings like all the other (At least 30) I have ever seen. Since I have never run across any other brass carburetor that was nickel plated I wonder if this might have been a salesmans sample, display carburetor or done by Maxwell for a show car chassis? I realize this is a lot of speculation on my part but since I already know this was not normal practice nothing else makes sense.