I've run across a guy who has a great looking set of (what appears to be original 68) seat belts. My question is about the buckles. None of the Mark of Excellence symbols have the blue paint on them --not even a speck. (I realize that could have been cleaned off through the years.) Has anyone seen this before? (Did any buckle in any model or year come like that?) Does anyone know what the name or number of the color of blue is?