Somebody who appeared in TV ads, famous before 1993, hawked his product/service which was not named after him, which was not technical, not food or drink, and not related to transportation. Mystery guest is not known for politics, arts, or sports, but that doesn’t mean his product/service wasn’t.
I remember K-tel records, but the founder is not an S-name. Other than that, I got nothin’. I pass.
Jason Alexander went bald when he was a young actor, and joined Hair Club For Men for a few years. But, as he told Howard Stern, a hairweave caused his scalp to sweat a lot. Sweat and dead skin eventually formed a “cheese” under the rug that started to smell bad. He eventually gave up the rug, and gained success as a bald man.