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The movement you have is a Hermle 261-080B and requires a pendulum length of 23cm. This will give you 136 beats per minute.
Take a look at this page on ebay http://www.ebay.com/sch/i.html?_sacat=0&_from=R40&_nkw=zaandam+clock&_nkwusc=zaadam+clock&_rdc=1and you should see some clocks to match up your pendulum style and some pendulums for sale up there.
Hope this helps and Happy Holidays!