The photographer might have used a black "flag" to block light from reaching the upper zone of her head. The side light does fall on the lower hair - near the shoulder - giving it an "accent".
I suppose the photographer wanted to simulate an office environment with light coming from the sides and avoid the portrait cliché of the accent light on to upper head.
In any case I agree that light disposition alone is not going to convey much "vintage" atmosphere.
well said. I agree a good set of flags, scrims and loads of black wrap can be your best friend. in the early days of cinema (especially in Fort Lee, NJ and in Manhattan) sailers often were hired for rigging the "gaffs and flags" used for open-roof studios.
"The real work was thinking, just thinking." - Charles Chaplin