Via a comment from Ned (Thanks, Ned!) , here is the video of the original Bunmeido Kasutera commercial from the 1960s that I mentioned in my kasutera article [1]:
The little teddy bears are singing:
Kasutera number one,
Telephone number two,
Three o'clock snack is Bunmeido
The version I remember was in color, probably from the late '70s or so, but it was basically the same bear puppets. It makes no sense whatsoever, I know. So amusing, quaint, and kawaii, ne. :P
Links:
[1] http://www.justhungry.com/2006/08/oyatsu_and_kasutera_castella_a.html