Not to start a fight with Scott but, all of the NOS and low mile original ones I have had have been bare steel with a bare steel clamp and a black bolt. Mike
I just sold my last NOS one a while back. I don't think I saved a pic of it. Clamp is bare steel. Special bolt/ lockwasher/nut are clear zinc. Bolt has a triangle marking on the top IIRC, not found anywhere else.