This is a beauty to look at and has a beauty in the mechanical solution of its complications.
I love watch complications and simple and clear design - so this one is an ultimate (and unaffordable) teaser for me
Day-Night from Ochs.
Besides the time in the middle you see the sun and moon spinning clockwise around once each day. When the sun is in the upper lighter area, it's daylight, when down in the dark, it is below the horizon during night.
What is more: over the course of each month the moon comes closer to the sun, slips under it (new moon), overtakes it until opposite (full moon).
Even better: over the course of the year, the horizon shades move up and down to modify the length of daytime/nighttime.
When you are out in the woods and point the "12" southwards, you find sun and moon located exactly where indicated on the scale.
What an ingenious mechanical timepiece!
There is a video here where its inventor introduces it much better than I can do
https://youtu.be/12Jq4ZVxtL8