An original episode of the Dutch co-production Sesamstraat from 1976 (their first season) has recently been posted on YT... someone is speculating it's the first episode of the series, but nobody has been able to confirm it... either way, it's interesting to look at...
http://www.youtube.com/watch?v=UCPxaG4vJ_8
http://www.youtube.com/watch?v=nEXsh_TCmdQ
http://www.youtube.com/watch?v=UCPxaG4vJ_8
http://www.youtube.com/watch?v=nEXsh_TCmdQ