I love to look through my vintage S&T magazines, and look at the telescope ads. They bring back fond memories from when I use to look at the same ads many years back.
The farthest back ones I can remember are the classic Edmund telescopes from their catalog, especially the 3 inch reflector and the 4 1/2 inch one.
From the S&T mags, the Celestron ads, especially the orange tube C-8 plus, which advanced to the Super C-8. Also the orange tube C-80, and the C-90 mak.
Then there are the two page Unitron ads in S&T, which I would take a magnifying glass and read them.
The Dynascope ads were really inviting. especially the pretty colored 8 SCT, which turned out to not be as good optically as it looked.
Parks had some very good looking ads, and some very great large telescopes.
I love looking at them all, many not mentioned, and even the large binocular ads.
I do not want to leave out Questar and Quantum.