Gilbert Maranville Calendar Clock

This drop octagon wall clock with slant front and “ears” on the side was made around the 1860s to 1870s. It has a Gilbert 8 day time and strike movement with simple calendar (date only). The clock strikes the hour on a coil gong (clocks this old don’t usually do half-hour strike).

It has a special calendar dial patented by Galusha Maranville in 1861. There are two painted manually rotated discs behind the main dial; one has the months January – December and the other the days of the week Sunday – Saturday (with Sundays in red) repeated multiple times around the outside. At the start of each month, you use the key to turn the squares at the top and bottom of the dial so the name of the month is visible in the aperture at the top, and to align the correct days of the week with the dates for that month.

Also at the start of a new month, you move the red calendar hand ahead to “1” (first day of the month) every month (on standard calendar clocks you do this only if the previous month had less than 31 days). Be sure to do this anytime from about 6 a.m. up through late afternoon. If tried too late in the day the calendar hand will already be engaged and getting ready to move ahead to the next day.

See more pictures.

The book “Survey of American Calendar Clocks” by Miller and Miller, 1972 shows this clock on page 130.

Repair job 8689. I tightened the click rivets and the clicksprings. This clock has short, thick steel clicksprings. I burnished the pivots and installed 15 bushings. The mainsprings are original:
Time: 3/4 x 0.019″
Strike: 11/16 x 0.019″
They are quite thick at 0.019 inches, but this old material has less strength than modern spring steel, and so these mainsprings are not too strong for the clock. There is little wear to the mainwheel teeth, around 5% or less.

I also installed new wires in 3 pinions and reversed the wires in another.

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