RP-12.            $10

German “flip clock”, ca. 1920.  I see no indication of maker on this clock and have not seen it before, but I think it is German-made early in the last century.  I did not open the assembly.  It stands 6.5-inches tall on brass ball feet, with brass columns and a mahogany top and base.  The glass cylinder is cracked in the back.  I wound it but it sounds like the spring is broken or unattached, and it will not run. Maybe you can fix it and find out who made it.  $10–$100.