Facebook Marketplace can be a wild place. One minute you can be searching for Beanie Babies from the early 1990s and the next stumbling upon an ultra-rare one-of-twelve 1939 GM Futurliner. Crazy times we’re living in.

For those unfamiliar with the GM Futurliner, here’s the deal. In 1936, General Motors debuted its Parade of Progress along a 150-stop circuit crossing both the United States and Canada. This traveling exhibition displayed future cars and technology. A fleet of eight streamlined buses were utilized for this display. Three years later, GM head of research Charles Kettering asked Harley Earl to design a more impressive vehicle for the exhibition. What Earl came up with became the Futurliner.

Standing at 33 feet long, 8 feet wide, and more than 11 feet tall, the Futurliner was an imposing work of modern art. Each Futurliner was heavily stylized in an art deco theme with streamlined body panels, deep red side and white roof paint, large articulated chrome side panels, whitewall tires, and an iconic high-mounted driver command center featuring a panoramic windshield. Each Futurliner featured a large self-contained stage and prominent deployable light tower, and each vehicle carried a single themed exhibit. The Futurliners, along with 32 support vehicles, were driven by 50 college graduates, who also staffed the exhibitions along the route.

The original powertrain for the Futurliner was a four-cylinder Detroit diesel engine mated to a four-speed automatic transmission and a gear splitter. This combination gave the vehicles a top speed of about 40 mph. GM’s Parade of Progress was put on hiatus during WWII, however, when it resumed in 1953, the Futurliner fleet had been refurbished with 302-cubic-inch GM gasoline inline six-cylinder engines that produced 145 hp.

Of the 12 total Futurliners built, only eight are known to still exist today (or four, according to the unrelated embedded Futurliner YouTube video), which is what makes one popping up on Facebook Marketplace even more intriguing. Located in Springfield, Massachusetts, this bus appears to be in pristine shape, having been previously restored in the 1990s. The bus belongs to the Peter Pan Bus Line and is one of two that the company currently owns, though the second example is in notably less desirable shape.

During the restoration the gasoline engine was removed and instead replaced with a Detroit Diesel 4-71 backed by an Allison automatic transmission. This two-stroke four-cylinder diesel engine displaces 4.7 liters and is capable of producing up to 190 hp and 525 lb-ft of torque. The seller says this combination brings the top-speed to a more acceptable, though still slow, 50 mph. The vehicle has also been updated with power assist steering, which wasn’t an option in 1939.

This Futurliner is believed to be either number six or seven, depending on the source, and carried either the “Energy & Man” exhibit or “Outside The City Muddle” exhibit in the Parade of Progress.

In 2015 a restored Futurliner sold at auction for more than $4.4 million dollars, which makes the asking price of just $998,900 a pretty fair deal. In typical Marketplace fashion, however, the seller requested that prospective buyers “Please do not waste my time – NO trades, NO ridiculous offers,” so we’d refrain from hitting that “Is it available?” button just for fun.