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[Linked Image from 2.bp.blogspot.com]

Circa 1969, here's a signed Barry Windsor-Smith Medusa pin-up page.

No idea where it saw print.

There's a lot of "A Marvel Masterwork Pin-up" pages that don't look at all familiar to me. That possibly ran in a Marvel reprint title like COLLECTORS' ITEM CLASSICS or MARVEL COMICS PRESENTS, or possibly were only available from Marvel to fans who wrote in, exclusives sent out in packages to Marvel fan club subscribers.

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EDIT : I found the source for this one.
It appeared in MARVEL COLLECTORS ITEM CLASSICS 21, June 1969,

https://readallcomics.com/marvel-collectors-item-classics-21/
( the series title changed to MARVEL'S GREATEST COMICS in issues 23-96, continuing reprints of the Lee / Kirby FF run.)

Accompanying the Barry Smith pin-up are :
reprint of a Lee and Kirby/Stone story from FF 29,
a Lee and Heck/Ayers Iron Man story from TALES OF SUSPENSE 62,
a Lee and Lieber/Roussos The Watcher story from TALES OF SUSPENSE 56,
and a Lee/Ditko Doctor Strange story from .STRANGE TALES 130.
Along with 2 more pin-ups, one by Kirby, the other by Ditko.

From 1967-1969, Barry Smith did a lot of filler pin-ups, first for Marvel's British reprint tittles in the U.K.
Then after arriving in the U.S, .did the same in Marvel's titles here.

Smith did about 20 of these filler pin-ups, before he moved on to doing covers and full stories.
https://www.comics.org/penciller/name/barry%20smith/sort/chrono/