two-seater mid-engined sports car designed by Bertone and manufactured by Fiat from 1972-1982 and subsequently by Bertone from 1982-1989. With a transverse engine and gearbox in a mid-mounted, rear-wheel drive configuration.
If you mean original mid-engined 2-seater production car, that honour goes to the Bonnet Djet (which became the Matra Jet).
I was referring to the fact that the Toyota MR2 series one is a very good clone of the X1/9 👍