Oh yeah, De Tomaso built something other than the Pantera.
Technically speaking, the first De Tomaso model was a small sports car called the Vallelunga, but not many of these were ever made and they're quite different from the cars which would later make a name for De Tomaso. The company's first supercar was this one, the Mangusta. Like the Pantera that would come after it, the Mangusta is powered by a Ford HiPo 289 V8 with a body designed by Ghia, although the clamshell engine compartment is unique.
401 units of the car were built from 1967 to 1971, although only an estimated 250 have survived until today. The one you see here still has its original paint and interior, something which RM Auctions (the firm handling the auction) estimates to be an incredibly rare thing for any De Tomaso. It has not been restored, but it has spent 20 years sitting in a museum, so it hasn't had the most stressful life. It is, so far as the experts can tell, the only Mangusta to have been fitted with six headlights from the factory. It is expected to go for as much as $2 million.