Why don't you email Bruce Johnson at Oregonphotos.com? He has a page about the history of gear:

http://www.oregonphotos.com/Backpacking-Revolution1.html

On this page, near the bottom, there's a photo that has the corner of a North Face Dandelion tent visible...maybe you can tell from that if that's what you have.

http://www.oregonphotos.com/Geodesic-tent1.html