

Can anyone identify this watch?
I found this in my late grandfathers office. He was not a watch guy and his other pieces are all cheap $20-80 quartz mass produced watches, but this one is mechanical and has a real brand name. I have had no luck finding this model with what I imagine is the serial number on the back anywhere online, so I was wondering if anyone has ever seen anything like it.
Stats I can see:
Lucien Piccard
26569BU
It also looks as though two of the smaller hands are missing? The movement still runs rather smoothly and keeps time with the main hands fairly accurately from what I’ve seen, but I don’t have any time graphing tools.