Buster Brown shoes are still manufactured and available for sale online, though only as baby shoes. They are named for the Buster Brown comic strip in 1904.
That’s sort of a reverse situation of the one(s) presented in this thread: the peanut butter previously existed under different names and had its name changed to capitalize on the character’s popularity.
I’m not sure how that’s much different: Miles Laboratories had a chewable vitamin called Chocks that predated Flintstones Vitamins (which were clearly named to capitalize on the popularity of the Flintstones which was already off the air by 1968).
I see those all the time, and I never made the connection; I only vaguely knew that at some point in the past there had been a TV character called “Lambchop!”
That’s the winner in my book. Buster Brown and The Yellow Kid cartoonist, Richard F. Outcault was raking in $75,000 a year in merchandising in 1905! That’s almost $3 million in 2026 dollars.
Per Wiki the Buster Brown comics were published until 1923. So the shoes’ production has now outlasted the comics by 103 years.
AIUI that’s the measure of merit the OP is asking for: years from end of media property production to end of spinoff product production (or to today for spinoffs still in production).
The corresponding numbers for Flintstones vitamins are 1966 to now equals 60 years. Not even close.
I agree w @Elmer_J.Fudd that we’re real unlikely to find anything to defeat Buster Brown. Great find there @RealityChuck!
Media to promo product tie-ins were fairly new ideas in the early 20th century. Maybe the very earliest in the 1880s. So to beat Buster Brown we’d need to find something that is still in production now based off a media property that ended before 1923. Or assuming my 1880 cut-off is legit, some media property that ended then whose spin-off product lasted beyond 103 years later; so 1984 or later. Or something in between those two edge cases.
I remember Chocks. The advertisements anyway. Must have been the same thing as Flintstones; as I recall (and I could be wrong), Chocks vitamins disappeared at about the same time as Flintstones vitamins appeared. Same thing, different packaging?