The torsion pendulum on our anniversary mantel clock spins away night and day. Anniversary Clocks got their name because they were designed to run for over a year without being wound. Sometimes they are referred to as 400 day clocks. The idea was that by giving one as a wedding present, it could be wound again on each and every anniversary of the day it was given. Canon G10, 0.8s at f/4.0, ISO 100, 88mm equivalent focal length in macro mode.