See the back the back page for sketches of the Fantastic Four costume emblem. These sketches are most likely by Stan Lee. They are printed on the back of the Marvel Visionaries: Stan Lee hardcover.
Scans of original art are from the Kirby Museum's Original Art Digital Archive.
Scans of pencil art photocopies for the Kirby Museum's Pencil Art Photocopy Archive courtesy of the Kirby Family, with thanks to TwoMorrows Publishing.
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Symbol in the chest...
It's a historical page that I never saw before, wow!
The brainstorming of the design of the symbol shown at the back of the page it's a great find. But it's curious that it was done at page 16, when the uniform was shown for first time in page 7.
Another curiousity is that the design shown at the back of the original has the extrusion or shadow towards the bottom right, while in the whole comic it's shown at the opposite with only an exception, in page 19 panel 2.