Haircutting in Downtown Abbey
The television show, Downtown Abbey, takes place in the early 1920s, and it can be found on Netflix. Because the focus is the 1920s, of course there's going to be some bob haircuts.
In the final episode from Season 6, Episode 9, "The Finale," Daisy tries to cut her own hair. There's a small haircutting scene where she cuts her hair, and another one a few minutes after this one.