Most wall clocks use a quartz crystal controlled movement, with a motor and gears to move the hands. Have a look at the wikipedia entry. http://en.wikipedia.org/wiki/Quartz_clock
Not much to them...a battery, a coil, a crystal, and an IC embedded in a blob of epoxy. So the schematic is a block with six contacts: two for the battery, two for the crystal, and two for the coil. Never seen a "schematic" of the IC.