In Stella Dallas (1937), what's the name of the silent film that Stella and Stephen watch?

I watched Stella Dallas for the first time today and was fascinated by the sequence where Stella and Stephen go to the cinema at the beginning of the movie, which is set in 1919. Compared to Stella Dallas's 1919 costuming (which is just 1937 fashion with no real attempt at period dressing), the silent film they're watching genuinely appears as though its from the 1910s. I've looked on IMDB and similar sites but am struggling to discover the identity of this film-within-a-film. Perhaps it's one that's now considered lost? Does anyone here have any ideas? Thanks so much for your help!