is the difference in patina between dial and hand something to worry about? Those dial mounting points look a bit dodgy too
I think it is a “Franken sun dial” the gnomon and dial are definitely from 2 different sundials. Maybe even 2 different manufacturers.
Get your watchmaker to check it out on a timegrapher (mine, from Amazon, is below), and you’ll have a nice daily wearer.
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