Dear kksuns -
I thought the exact same thing when I first saw the photo - the poor birds in that thing! I bet they did have sandpaper perches too, I was too small to remember.
I don't think people knew as much in the early 70s as they did today. We have learned a lot about how to care well for our feathered friends!
I asked my mom and she thinks this wasn't Gandalf, our parakeet. She thinks this cage held our pair of finches. So I'll have to track down a photo of Gandalf and his cage, if I have it somewhere around here. We did enjoy birds!