There were several (perhaps more?) used during the series.
The Batmobile's Start Button and label, Batman and Robin (looking at the lawsuit paper, first episode), Robin on a black phone, and Commish Gordon (?).
Alfred came down the pole like a pro according to Robin, and as Alfred stated he alway wanted to do that but once is enough, from now on he will use the service elevator http://img.photobucket.com/albums/v123/apennyworth/batman/batcave/alfreddownbpolescopy.jpg~original The service elevator in the Ba...
Here are the GH Whitman coloring books http://img.photobucket.com/albums/v123/apennyworth/greenhornet/collectables/GHColoringBooks.jpg~original and I've showed this in the past http://img.photobucket.com/albums/v123/apennyworth/batman/batandhornetcollection.jpg There are several variation in the GH ...
Forgot this great Van Williams signed poster, thanks to Scott S. for this one! http://img.photobucket.com/albums/v123/apennyworth/greenhornet/collectables/VanPosterSigned.jpg~original and here are the vintage Gold Key comics with their Spanish printings. http://img.photobucket.com/albums/v123/apenny...
some of my GH autograph/signature collection http://img.photobucket.com/albums/v123/apennyworth/greenhornet/collectables/GHAutographs.jpg~original and just in time for the holiday Happy Halloween http://img.photobucket.com/albums/v123/apennyworth/greenhornet/collectables/GHHalloween.jpg~original