I had this clock for a long while without being able to find any information about it. The worst part was that I couldn't figure out how to open it, and was afraid I would damage it trying. It looked and worked like a rotary clock, with the single pointer made to look like a sundial gnomon rotating around the dial marked in five and fifteen minute increments as well as hours.

Most rotary clocks open from the bottom, which is what I tried with this one, without effect. The clock was winding and running, but I really wanted to see the inside.

Finally I decided to risk prying off what appeared to be a press-fit top. Success! Inside was the standard Lux rotary clock movement.

This is what Herman Lux used for his 1935 mystery rotary clock. These are most often seen in the "tape measure" clocks. I had never seen one of these sundial clocks before.

The sundial version can be hung on a wall, where the gnomon pointer casts a shadow, or used as a shelf or desktop clock. This one has what I think is a very attractive naturally aged look.