1966 Formula S fender tag

I bought this 1966 Formula S Barracuda. When I removed and was checking out the fender tag there was a small hole in the shape of a perfect S that was punched through the tag. I was wondering if anybody else may have seen something similar on there 65,66 Formula S tag.

I had a 68 Formula S and I don't remember anything like that on that fender tag.