I think this is a Rodenstock Yesette from around 1938. Rodenstock didn't make cameras, they mounted their lenses on Welta cameras. Rodenstock still makes excellent lenses. This camera has an f2.9 Trintar mounted in a Compur shutter.
Somewhere down in this orchestra pit is a loved one. I think it's the cellist in front of the door on your left. He's missing in the first photo. I could be wrong though. Close study shows a considerable amount of movement in this long lost orchestra.
This woman has a story to tell and I don't think it's a happy one. She's got her cigarettes, her calculator, coffee cup and purse. Something's missing.