I recently removed my horns to remove some overspray and noticed a few things. Firstly they are the olive drab color, which I was expecting as this a 1970 car. Here's a pic during the cleaning process. When I started to wire brush the backs of the horns I noticed that the decibel rating was 110dB, not the 115dB rating I have seen in pictures. Here are pictures of the backs. I have read posts talking about later horns being black in color and I was wondering if this was when the change