800px-1974_Triumph_Spitfire4

The Triumph Spitfire is a small English two-seat sports car, introduced at the London Motor Show in 1962.[3] The vehicle was based on a design produced for Standard-Triumph in 1957 by Italian designer Giovanni Michelotti. The platform for the car was largely based upon the chassis, engine, and running gear of the Triumph Herald saloon, and was manufactured at the Standard-Triumph works at Canley, in Coventry. As was typical for cars of this era, the bodywork was fitted onto a separate structural chassis, but for the Spitfire, which was designed as an open top or convertible sports car from the outset, the ladder chassis was reinforced for additional rigidity by the use of structural components within the bodywork. The Spitfire was provided with a manual hood for weather protection, the design improving to a folding hood for later models. Factory-manufactured hard-tops were also available.

Models
Five Spitfire models were sold during the production run:
Number built
Triumph Spitfire 4 (Mark 1) 1147 cc inline 4 Oct 1962 – Dec 1964 45,753
Triumph Spitfire 4 Mark 2 1147 cc inline 4 Dec 1964 – Jan 1967 37,409
Triumph Spitfire Mark 3 1296 cc inline 4 Jan 1967– Dec 1970 65,320
Triumph Spitfire Mark IV 1296 cc inline 4 Nov 1970 – Dec 1974 70,021
Triumph Spitfire 1500 1493 cc inline 4 Dec 1974 – Aug 1980 95,829

Origins
The Triumph Spitfire was originally devised by Standard-Triumph to compete in the small sports car market that had opened up with the introduction of the Austin-Healey Sprite. The Sprite had used the basic drive train of the Austin A30/35 in a light body to make up a budget sports car; Triumph’s idea was to use the mechanicals from their small saloon, the Herald, to underpin the new project. Triumph had one advantage, however; where the Austin A30 range was of unitary construction, the Herald featured a separate chassis. It was Triumph’s intention to cut that chassis down and clothe it in a sports body, saving the costs of developing a completely new chassis / body unit.

Italian designer Michelotti—who had already penned the Herald—was commissioned for the new project, and came up with a traditional, swooping body. Wind-up windows were provided (in contrast to the Sprite/Midget, which still featured sidescreens, also called curtains, at that time), as well as a single-piece front end which tilted forwards to offer unrivalled access to the engine. At the dawn of the 1960s, however, Standard-Triumph was in deep financial trouble, and unable to put the new car into production; it was not until the company was taken over by the Leyland organization funds became available and the car was launched. Leyland officials, taking stock of their new acquisition, found Michelotti’s prototype hiding under a dust sheet in a corner of the factory and rapidly approved it for production.

SOURCE WIKIPEDIA