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[Linked Image from vaultcollectibles.com]

Grell's pin-up contribuion to SUPERMAN 400 in 1984. This a signed version from an overpriced portfolio made of the pin-up pages in that issue.
All the pages may have been signed as this one is by Grell, but I don't recall these pages being signed when I looked at the actual portfolio.

Here's the full issue, with all the stories and pin-ups :
https://readcomiconline.li/Comic/Superman-1939/Issue-400?id=16245