Ok I don't know whether this qualifies as "machinery", so if not please feel free to move it to the correct sub forum.
Does anyone know how to properly and easily identify, differentiate between a Starrett, Brown & Sharpe, Miller Falls old try square heads. Old being 25+ years. The rules are easy--they are marked, but I can't find any makers marks on the head(s).
I've noticed that on some heads the sides are knurled--for lack of a better description, and some are just smooth.
Why do I care? I'd like to keep the unit with the associated parts.
I Gauging marks their heads but I'm lost with the older heads.
thks
smitty