Jimi Hendrix, John Mayall and Albert King played a series of concerts at San Francisco's storied Fillmore and Winterland music venues in February 1968; the poster advertising the shows featured a bloodshot eyeball flying through a ring of fire.
"It was totally cool and a your-mother-would-shriek-if-she-saw-it kind of thing," said Ben Marks, a collector of vintage rock posters.
If you were lucky enough to be there, you have the memories. If you nabbed a poster, you may have much more.
A first printing of the poster in mint condition might sell for $10,000, said Marks, senior editor at Collectors Weekly, a San Francisco-based website that's part auction, part social media and part news site.
It's just one example, albeit an extreme one, of the market for boomer collectibles. Toys, music, furniture, sporting goods, politics — many of the things that the baby boom generation cherished as children and young adults now have monetary value.
According to Collectors Weekly, a 1969 Hot Wheels custom T-Bird recently sold on eBay for $502. A 1959 Sony transistor radio went for $256 and a 1966 Barbie doll brought $710.
The common thread among these items is condition: They're in original boxes or are in like-new or lightly used shape. That's usually the linchpin of any collectible, dealers say.
Take that Jimi Hendrix poster.