KH Front Rotor Questions

Hi, have a set of s/b Kelsey Haynes on the front of our 67 Cuda. Currently in the process of trying to get a brake and light inspection done and one of the things they need is a wear spec for the rotors and they couldn't find it because it's dirty. Can't seem to figure out if it is said on the rotor or not anywhere after digging around on it. Any ideas if it is on the rotor where it is at? Thanks