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One of my favorites, an ad that ran in all the Nov 1982 Marvel comics, an SQ productions ad that offered a very inexpensive (but also very nice) Michael Golden poster.
[Linked Image from lh6.googleusercontent.com]

And here's the actual poster, in its full 11" X 17" size...
https://lh4.googleusercontent.com/-...1600/golden+-+marvel+universe+-+1982.jpg

This below blog post link shows you the complete poster, with SQ Productions promo-pages attached. Basically, it's a foldout poster of four 8 X 11 pages, the center two being the poster, inside the larger 8-page foldout catalog. SQ productions actually went out of business (briefly) in the 2 or 3 months after this promo was offered. I spoke to several who ordered it and never received it. I ordered one, and looking again at the comic ad, liked it so much I later submitted a second payment for a second poster. Then a long silence, thinking I'd never receive it.
And one wonderful day, I found both of them in my mailbox, mailed in two separate decorative envelopes (shown in linked photos).
http://marvel1980s.blogspot.com/2011/05/1982-michael-goldens-marvel-universe.html?spref=pi

In particular I recall the ad ran a month after DOCTOR STRANGE 55, because that issue had a gorgeously illustrated Golden story, at a time (1981-1982) I consider the absolute peak period of Golden's work.
https://viewcomiconline.com/doctor-strange-v2-master-of-the-mystic-arts-55/
(DOCTOR STRANGE was bi-monthly, so the ad appeared in the month between issues, in other Marvel titles: )
https://viewcomiconline.com/power-man-and-iron-fist-1978-issue-87/

A Michael Golden DOCTOR STRANGE PORTFOLIO, another collection of exceptional Golden pages, was released about the same time.
https://capnscomics.blogspot.com/2013/01/doc-strange-by-mike-golden.html

Another example of Michael Golden's peak work is AVENGERS ANNUAL 10, out in Oct 1981 :
https://viewcomiconline.com/avengers-v1-annual-010/


DOCTOR STRANGE 55 came out just a few months after some of Golden's other outstanding work, in MARVEL FANFARE 1 and 2.
https://viewcomiconline.com/marvel-fanfare-1982-issue-1/
https://viewcomiconline.com/marvel-fanfare-1982-issue-2/

There were two more short inventory stories by Golden in MARVEL FANFARE 4, that look like they sat in an inventory file from the time Golden first entered comics in 1977.
FANFARE dug up quite a few of these inventory stories by various artists.
https://viewcomiconline.com/marvel-fanfare-1982-issue-4/
Another Golden inventory story, "Huntsman", saw print in BIZARRE ADVENTURES 28 in 1982, clearly a fill-in story intended for the short-lived LOGAN'S RUN series, also from 1977, and most of those issues were by George Perez / Klaus Janson (issues 1-5), then Sutton/Austin (issue 6), and Sutton/Janson (issue 7). .
https://viewcomiconline.com/bizarre-adventures-issue-28/
https://readcomiconline.li/Comic/Logan-s-Run/Issue-1?id=130474
https://viewcomiconline.com/logans-run-1977-002/

And one last 32-page Golden masterwork, that he clearly labored over off and on for 8 years before submitting, in MARVEL FANFARE 47, well worth the wait.
https://viewcomiconline.com/marvel-fanfare-1982-issue-47/