[vortalexfan]

What kind of motor does your "flip dial" clock use? There were many different variations, of which the most common type of motor used by "flip dial" clocks were the old Japanese made Copal Motors which tended to have issues with seizing up over time and they could be "rebuilt" but it was kind of hard to do so without damaging the plastic housing cover that covered the motor gears.

Then there was the Intermatic motors like the ones used in the old Intermatic wall timers from the 1960s-1990s, those were actually a lot easier to service as you could just get parts by picking up an old wall timer from 1960s-1990s and strip parts from those, to replace the commonly stripped "idler" gear in them.

Finally then you have the Telechron rotor type and their knock-off counterparts which are always prone to seizing up due to old gummy oil that needs to be "boiled" out of the rotors and then new oil put in either through heat and a vacuum pump or by drilling a small hole into the back of the rotor and dropping a few drops of 20 wt motor oil into the rotor housing and sealing up the hole with a daub of solder and then either freeing up the rotor by using a pair of pliers on the rotor shaft or running the rotor with electricity applied to it through its stator coil assembly until it frees itself up.

Either way they're fairly simple to resurrect, when you know what kind of motor you're dealing with.