I don't think fake joke ads count as vintage.
About seven or eight years ago, I made this fake ad, exhorting parents to give soda to their babies. It was done on a bored afternoon when J.D. Ryznar asked for someone to make that very specific thing on his livejournal. I whipped it together, posted it to the web, joke over.
THEN. A couple of years later- it started showing up online, in those weird lists that pop up every so often with a “Oh man, ads sure were strange back then, weren’t they?” theme. Thing is, those ads are largely real and mine is not and very obviously so.