I have that in the kitchen in the apartment that I moved into recently. I tried to find some instructions on the web but the only thing that comes up is their leaflet from ~1940. Any idea what is it and how it works? The black ring around "clock" with day/night is made out of little things that you can push in and pull out of it. When you push them in you can see the red ring underneath as you can see between 6 and 9 on Day part. It might be a silly question but I have never met with a thing like that and as it gets cold would love to figure out how it works.