Well, this was an intresing cine optical sound camera back in it's day. The company is original know as "Auricon", but Walter Bach was one of it's main engeneers so the company is also know as "Bach" or "Auricon-Bach":
https://www.youtube.com/watch?v=6qpE5aeG5cY
And here is a nice recently image + sound recording with such camera:
https://www.youtube.com/watch?v=DOovPFoIWLQ
The audio frequency response isn't High-Fidelity, but it does rembers you of the old days.