Survivor 1972 Dodge D100 found.....

I had a small amount of time this evening to myself, so I pulled the right/front wheel so I could clean and polish the wheel, cap, and lug nuts as well as paint up the drum brake. However before painting I snapped a picture of the drum to see if anyone is familiar with these markings painted on the drum. The old white spokes cleaned up pretty well as did the chrome pieces. Still have one wheel remaining of the four to do then they'll all finally be done!