http://www.treewalkertreestands.com/
I had one of these 25 years ago. It had a piece of angle that went around the back of the tree vs. the wrapped chain as the newer models do. I gave it to a buddy after 10 years or so, he still uses it. The platform was a little narrow. Aside from that, it was by far the best climber I ever used. I never used a safety system with it... bad idea, but it was so solid on the tree I never felt a bit spooked even at the ridiculous heights I hunted at back then. Since then I have owned Ol Man, Lone wolf, and Summit stands. None compare, though the Summit is my favorite of those three. I still use a Summit Viper. It's tolerable, but does not grip the tree nearly as well.