Nice pic Brian. Looks like it has a lot of modifications from the original spec.
I don't think I have any marks like that on my bull gear. Chalk marks on a suitable change wheel are my preferred way to do something similar.
60 divisions… so what is the feed screw pitch then? My cross slide and compound are both 12TPI and the cross slide has an 80 division dial… which only gives a rough number of thou because the pitch is 83.3 thou.
Regards, Andy