Check the provenance. There are some fakes coming out of Judah.
This one's Fabrique de Paris but all other inscriptions are in Deutsch or possibly Nederlands.
In fact I'm getting quite intrigued by this. I have a due south facing wall to the house, but it's right on the boundary so my neighbours would benefit but not me.
Now, if I put it on a south facing wall inside and rig up a RasPi controlled moving light source ......
...... yes, strip of LEDs switched individually by time of day. I could even have a sundial that doesn't need correction for the Equation of Time 😎