[thinktreasure]

Is it a "clock radio" in the modern sense (clock controlling the radio's power, to wake you up), or is it two independent devices housed in the same cabinet?  I don't see any controls near the clock face.

It's not a clock radio in that sense, but a clock and radio
I haven't posted anything on the clock before this.

The clock is a Sessions clock with a hammond motor (sometimes called a pancake motor). It is one of the first electric clocks made. The motor has no physical contact with power.
The patent for the hammond motor was filed in 1929

http://www.freepatentsonline.com/1924853.pdf

This clock will NOT start by itself. There are 2 controls, one to set the clock, the other to spin it up to start.
You can actually start it to run in reverse

If the power is interrupted, the clock will stop and not restart.... unless it's manually started again