Because the front engine and transmission of the 128 Saloon didn't allow
for a smart bodied 128 Spider, Nuccio Bertone desided to go for a mid-engined
concept, having some experience with the mid-engined Lamborghini Miura and
Marzal.
For the Turin Autoshow of 1969, Bertone produced a 'show car' called Bertone
Runabout Barchetta, to try the public's opinion.
In 1973 the X 1/9 was introduced as the 850 Spider replacement.
'X 1/9' is actually the project code given to this car, as was
'X 1/1' the project code of the 128 saloon, 'X 1/3' of
the 130 saloon and initially 'X 1/8' and later 'X 1/20' for the successor of the X 1/9 (which
turned out to be not a Fiat but the Lancia Montecarlo!).
The vehicle identification number of the X1/9 is "ZFA128"
In 1977 a right-hand-drive version appeared and in 1982 Bertone took over the whole production process and sold it under their own brandname until production ceased in 1987.