This time, focusing on dinosaur merchandise from the American "Sinclair Oil Corporation" (hereinafter referred to as "Sinclair"), famous for its dinosaur logo, I started by searching for "Sinclair Oil" online. Immediately, I encountered U.S. vs. Iran oil issues from the early 20th century, followed by the "Anglo-Japanese Oil Agreement" and "Refinery Explosion" – all topics unrelated to dinosaurs. When dinosaurs finally appeared, it was only on this very Favorite website. While it might seem obvious, among dinosaur enthusiasts (especially in America), Sinclair is recognized as a major figure in the dinosaur world.
For example, the dinosaur collectibles book "DINOSAUR COLLECTIBLES" dedicates an entire chapter to Sinclair's dinosaur merchandise, and in "THE DINOSAUR SCRAPBOOK" by ultimate collector Don Glut, there's a detailed chapter with abundant photos showcasing the two World's Fairs (1933–'34 Chicago and 1964–'65 New York) where Sinclair exhibited life-sized dinosaur models. Sinclair also funded Barnum Brown's excavations. It's a misconception that the logo is a Diplodocus; it's actually a Brontosaurus.

Now, onto the merchandise. First, tin signs (Photos 1, 2). These are reproductions of old signs on tin, used for interior decoration and such. There are enthusiasts for these items and even specialty stores. More details can be found here:
http://www.candytower.com/

As an aside, the oil company "Dinoco" in the recent Disney CGI animated film "Cars" is said to be a parody of Sinclair, with its logo featuring a Tyrannosaurus-like silhouette (I, the author, have not seen it yet).

While commemorative goods from the 1930s Chicago World's Fair were mainly paper items like stamp books, for the 1960s New York World's Fair, numerous 20cm miniatures based on the Jonas Studios dinosaurs displayed outdoors were mass-produced (Photo 3). For more on this, please visit this website. It's an antique toy shop in Hida Takayama with an amazing selection (a feast for the eyes!). The photos of the World's Fair dinosaurs are also very interesting.
http://tenshu53.exblog.jp/i6

I also have other items, such as miniature toys (Photo 4), a brilliantly shining nickel ashtray (Photo 5), and a relatively new but rather pathetic stuffed toy (Photo 5). However, it seems there are countless Sinclair dinosaur goods, from stationery to tableware and even oil cans. With new items still being sold (though they don't tempt me), I can only give up.

There were also Japanese companies that used dinosaur logos or mascots... Sakura Bank (with Parasaurolophus 'Parasa' as its mascot) went extinct, and the current Nippon-Ham Fighters, after their former mascot, the Pteranodon 'Fighty,' had its niche stolen by a grizzly bear, soon won a championship... It seems extinct animals bring bad luck, perhaps? Among these, a personal highlight of an "extinct" company for those in the know is the legendary wrestling organization SWS. Their cool T-shirt with a Tyrannosaurus logo (Photo 7) is something I'm a bit proud of (even among wrestling fanatics).