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400 Day Clock

"Old World Quality and Craftsmanship©"

The following are copies of the original operating manuals published by the two leaders, in fact, the originators of the 400 - Day Anniversary Clocks; Kundo (1950), and the Schatz Lantern.  After you have reviewed these manuals, please see our section entitled "Maintenance" for further thoughts on the care of your timepiece.

KUNDO 1950 -

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Schatz Miniature 400 Day Clock Instruction Sheet ca. 1955

Describes how to unlock the pendulum, and how to wind, start, set and regulate the clock. Also gives instructions on replacing the suspension spring.


Maintenance: As with any precision mechanism, your clock needs periodic maintenance to keep it running reliably and to give it long life.  We recommend the following:

Three Year Lubrication and Inspection: After three years of operation, your clock should be inspected and lubricated.  We will check the overall condition of the movement, including the mainsprings, dirt deposits on the face of each wheel, and on each pivot, and excessive wear or movement (end-shake) of each wheel arbor.  Assuming each of the foregoing is within operating standards, we will lubricate each pivot and other points of contact using specially formulated clock/watch oil.  We will provide a written evaluation of your clock, our observations and recommendations as to when an overhaul should be completed.

Overhaul: Spring driven clocks need overhauling every 5 to 7 years.  The environment in which the clock is used plays a big role in the interval between overhauls.  As dust gets in the mechanism, the oil becomes an abrasive paste that causes wear.  The longer the clock runs in this condition, the more repair the clock will ultimately require.  Clocks have very strong mainsprings that will run the clock for years after the oil has gone bad, causing severe wear to pivots and pivot holes “bushings”.  If your clock stops and you spray it with oil to make it go again, it will continue to wear badly, because it is still dirty.  Shortcuts like cleaning the movement absent disassembly, even using an ultrasonic cleaner, cannot properly clean pivots, bushings, and mainsprings.  These techniques merely postpone the need for a proper overhaul.  During overhaul, the movement is taken apart and cleaned in a specially formulated ultrasonic solution.  Each component is examined for wear and damage, and checked for correct operation.  The necessary work is carried out including repair to pinions, polishing each pivot, replacement of worn bushings, the mainsprings are replaced (a broken mainspring can easily destroy the movement), the mainspring ratchets and lock mechanism are inspected, and the correct alignment and “meshing” of each gear is confirmed.  Each part is again cleaned; each pivot bushing is then cleaned and polished with a sharpened piece of peg-wood.  The movement is then reassembled and lubricated.  Finally, the movement is put into beat (via an electronic beat analyzer) and any adjustments made.  Your clock is “bench tested” for a minimum of two days and regulated for correct timekeeping, then assembled into its case and allowed to run for a minimum of one week.  A written evaluation of the movement, of each observation and any corrective action taken is provided.  This evaluation should be kept with the clock, as it will provide valuable maintenance history for the next repair facility and enhance its value for sale.

A properly maintained clock will, quite literally, run forever.  Each year our facility services many clocks two and even three hundred years of age.  

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