Perpetual calendar from Ivydene
This perpetual calendar stood on the mantelpiece in the dining room at Ivydene, the home of Lewis and Wynne Davenport, for years. The various knobs allow three things to be changed. Once a month, the knob on the base is used to change the position of the dates in the week. The other knobs control the month which shows in the top window, as well as the red line which is moved as dates are passed.