Harry F. Sinclair assembled the Sinclair Oil & Refining Corporation in 1916 by rolling up a string of smaller producers, and within a few years it was one of the largest independents in the country. (Sinclair was also caught up in the Teapot Dome scandal of the 1920s — a reminder that the oil business was as political as it was profitable.)
Sinclair’s masterstroke was marketing. In the 1930s it tied its motor oils to the idea that petroleum came from the age of the dinosaurs — "mellowed 80 million years" — and adopted a friendly green Brontosaurus as a mascot. Dino was pure genius: memorable, kid-friendly, and impossible to confuse with any competitor.
The dinosaur showed up everywhere — on signs, inflatable giveaways, and a famous dinosaur exhibit at the 1964 New York World’s Fair. Generations of American children knew Sinclair not as an oil company but as "the dinosaur gas."
Sinclair’s green Apatosaurus (marketed as a Brontosaurus) is one of the great figural mascots in advertising. Die-cut Dino signs, Dino figurals, and the green-and-white color scheme make Sinclair material some of the most decorative — and most collected — in the hobby.
Signs cut to the shape of the dinosaur are the definitive Sinclair collectible and a magnet for figural collectors.
Pump globes for Sinclair H-C and Dino Supreme gasolines carry the green branding onto the pump island.
Inflatable Dinos, banks, and World’s Fair souvenirs cross over into the toy and advertising markets.
Sinclair grows fast by absorbing independents; early signage is text-forward and heraldic.
The dinosaur mascot arrives to sell the "mellowed 80 million years" story; green becomes the brand color.
Sinclair’s Dinoland at the 1964 World’s Fair makes the mascot a national icon.
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