FWIW I have a used original 67 casting case that is marked identically to the above NOS example, most of the paint markings are worn away but there is enough still there to see what it is. All original stators I've seen (the exposed metal band) were bare steel coated in the insulating varnish and accordingly have a honey colored finish, some darker than others but it's all the same stuff.

MANY 69 and earlier alternators I've seen have been restored with incorrect paint markings, the pre 1970 cases definately need more scrutiny.