I just purchased a group of these, and found one of interest:

A note on the back said "Curl over C" and, yes, I definitely see a curl in that location:

But then, more obvious, is what I think is what is referred to as the "long double curl in hair". What do you think? Any plate number experts out there?

Note: The "curl" on the forehead is not really there ... I just brushed it off. Also looks like guide does in the lower right?