I am new to this site, i was searching for info on the web for Dyna Gym and this post came up. I know the machine you are talking about, i have one. I was trying to find replacement parts to get it running again. I have the paper work booklet and everything. I have always believed it was the original machine. A sales rep went from door to door selling this in the 70's. It had a small 3 rung ladder instead of the post. The glide board was green. if you want more info let me know. Mine does not glide smoothly - I think the rollers need replaced. As for the age of it, I would say that if taken care of it would be just as good if not better than the total gym of today.