Yep, that's what I was thinking of too, the one in your picture. I have a big vestibule on my tent-an EMS Pompero, which I got on eBay. That one has two zips on the vestibule.

It stakes down at one point in the center, then zips open in sort of half circles, which isn't the best setup. You can see it in the pics on my trip reports for Yosemite.

I have been looking for a website with pics of older tents, but haven't found a really comprehensive one.

This one is interesting though-
classic gear stories