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According to the history of Bulova on the site, the name Bulova Watch Co. wasn't adopted until 1923 Fifth. Before then it was the J. Bulova Co. And American Standard made cases for several watch companies. I don't think there is anyway to prove this movement and case left the factory assembled together. American Standard was still making cases for several watch companies during this time period. I read somewhere, I think it was in the book "Practical Watch Repairing" by Donald de Carle that it was common practice during this time period that a customer would go to a watch shop and pick out a movement and then pick out a case for it and the watch maker would assemble them.