About the item: From the collection of John Workman (Art Director from January 1978 to September 1984), this approximately 9 1/2 by 11 1/2 inch progressive press proof (made up of four acetate sheets of four separate colors that align to reveal how the ad will appear in the magazine) was used as a house ad in Heavy Metal Magazine (and possibly National Lampoon as well since both publications were owned by the same publisher). It is in excellent condition overall with some minor storage wear. It will be shipped with the utmost care. It is signed by hand on its reverse side by Workman. Please note- the signature is real. It is the actual, hand-signed signature of Workman. It is not a pre-printed image. About Progressive Press Proofs: Before the advent of computers, the coloring in magazines, newspapers, comic books etc., regardless of however many colors appeared to the eye, were made up of tiny dots in only four colors - yellow, blue (cyan), red (magenta) and black. Combined with the white of the paper and the way the human brain perceives the image, a wide variety of colors appear. The color separation (or color proof) was created to show what the actual, printed version of the image would ultimately look like (so, if any corrections were required, they would be caught before the publication went to press). In the process, each of the four colors are printed onto their own individual acetate sheet and are then lined up, one atop of the other, precisely and affixed to a white sheet of paper. When this is accomplished, the full color version of the image appears. ~Certificate of Authenticity/Provenance: Excepting pack-pulled autograph trading cards, CGC Signature Series, signed Sideshow prints, and like collectibles, all autographed items Vault Collectibles sells were personally witnessed, by myself, being signed by the writer, artist, or celebrity in question. No third party is involved. Further, art sketches - and most published original art I sell - were obtained directly from the artist themselves. For buyers desiring this guarantee in written form, this statement guarantees that the above referenced item is as stated in the listing description. A screen capture of the completed auction page, which includes this statement of provenance, may be saved by the buyer as a digital file or print off in hardcopy form. As this serves as written proof of said guarantee, no physical documentation will be included in the package when the item is mailed. J. Brian O?Bryant VaultCollectibles dba as empire.auctions