A scanned negative.
Although there is a calendar on the wall, it's not clear enough to read the date. However I'm pretty sure it's the late 1920s. The negative does have a couple of long scratches (maybe wound too tightly or grit on the rollers inside the camera) such that when I was holding it to the light, it looked like it may have been a wire and I thought at first he might be on the phone, but it's his smoking pose instead. I think he may have set up the camera with a timer.