Also known as “Torsion Pendulum Clocks,” American Aaron Crane invented and patented the first 400 Day Anniversary Clock in 1841. In 1879 German Anton Harder also created and patented one. Known as Anniversary Clocks or 400-Day Clocks because they can run for an entire year on a single winding. Winding occurred on a birthday or the anniversary of an event.
MAINTENANCE AND REPAIR
Repair the 400 day Anniversary Style Clock (Clockworks.com)https://www.clockworks.com/clock-repair/clock-repair-help-1.html
Schatz and Kundo Instruction Manuals (Billsclockworks.com) http://billsclockworks.com/opinstructions/400Day.htm