Sign-on and sign-off videos of Deutscher Fernsehfunk (DFF), the broadcaster of East Germany, from after German reunification in 1990, are available online. But the quality is poor. I am looking for a higher-quality version.
DFF was also responsible for the creation and production of Unser Sandmännchen, which came up during the search for "Clock Man" (the thread is missing for some reason, so here's the Google Cache version). After DFF shut down, it appears that RBB took over production, since the Unser Sandmännchenwebsite includes the RBB logo.