To all who may be concerned: Recently I sent a message to the Deutsches Uhrenmuseum (German clock museum)requesting a picture of the first cuckoo clock "invented" by Franz Anton Ketterer but Dr. Johannes Graf replied me this: "the story of the so-called first cuckoo clock by Franz Ketterer looks back upon a history of nearly 200 years. In 1810 Markus Fidelis Jaeck wrote in his book "Darstellungen der Industrie und des Verkehrs auf dem Schwarzwald" that Franz (Anton) Ketterer of Furtwangen invented the cuckoo clock around 1730. But this story cannot be true. Franz Anton Ketterer was born in 1734 and died in 1806. Ketterer could not have invented the cuckoo clock in 1730. So far as I know there aren't any remaining cuckoo clocks by Ketterer nor in the Deutsches Uhrenmuseum neither anywhere. Although it is clear that Ketterer could not have invented the cuckoo clock many people even today repeat that old fairy tale."