An anniversary clock is a clock that can last as long as 400 days on a single winding. The reasons these clocks are able to last so long is because of a slow torsion pendulum that sustains the clocks momentum to last a long time. These clocks are often decorative, and have a pendulum. The pendulums help the clock keep near perfect time, but this depends on a number of different thins. In different temperatures, for example, the pendulum can expand or contract, causing you to lose or gain time. Also, since gravity's pull is different at different altitudes, the time of the clock will be effected if you move it up or down a long way. Even the top floor or the bottom floor of a large building will make a difference! Some clocks can be adjusted for these changes, but either way, these clocks are more for decoration than for accurate time-keeping.
 Domed cherub Anniversary clock  US $9.99
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 Kundo Anniversary Clock Needs Wire NoReserve US $14.99
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 Kit Cat Clock 75th anniversary Limited ED MIB Black US $31.00
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 Vintage SCHATZ 400 day anniversary clock fixer spares US $10.50
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 KO Anniversary Clock Circa 1950s US $24.99
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 Kundo Anniversary clock US $17.50
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 VINTAGE KIENINGER OBERGFEL KUNDO ANNIVERSARY CLOCK US $125.00
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 BULOVA ANNIVERSARY MANTLE CLOCK US $12.99
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 Glass Dome for Anniversary Clock US $2.99
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 Small Anniversary Clock Movement US $6.07
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 2 vintage glass domed anniversary brass German clocks US $21.50
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 Schatz 400 Day German Anniversary Clock US $54.99
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