Kyoshos Scorpion series chassis was designed by the legend Akira Kogawa, and first introduced in 1982 with the 1/10 scale electric Scorpion and Beetle buggies, and was later used for the Tomahawk and Turbo Scorpion as well. Between the Tomahawk and the Turbo Scorpion, the gas powered Advance was introduced, later to be followed by the Assault. You can spot similarities in the chassis and drive train between the Scorpion and earlier Kyosho cars, like the electric Rally Sports and gas powered buggies like the Baja Body, the Fairlady 240Z and the various Circuit 20 buggies. The Scorpion series is often wrongly called (also by myself) the Circuit 1000 series. Of the Scorpion chassis cars, only the gas powered Assault and Advance also belongs to the Circuit 1000 series, a series of gas powered buggies that also includes the Stinger and Stinger MkII, even if those are 4WD buggies with more in common with the Optima. The Scorpion series of buggies were sold world wide as kits by the Kyosho brand, with a few exceptions. In the US they were sold as pre-built models by Cox Hobbies, and in certain European countries, Graupner marketed them as kits co-branded with Kyosho. I’m not sure if every model was sold in every market. There is also one more vintage Scorpion series model, the Sidewinder truck. The Sidewinder was only sold by Cox Hobbies in the US, and came ready built with an American truck body. This model was not sold anywhere else, and never under the Kyosho brand.