From a Classic Driver online listing:

Offered as an affordable, six-cylinder sports car, the first Triumph TR6 rolled off the production line in 1968 as a 1969 model. It’s intended target was to rival similar sports cars at the time, and although most were designed with sleek, curved lines, the TR6 was squared off at both ends, making it stand out from it’s competitors. With just a seven year production span, the TR6 grew to become a true British classic.

The Triumph TR6 was offered as a convertible only, with a factory steel hard top available optionally.

Triumph produced a range of TR models, from the TR1 right up to a limited run of the TR8, but it was the sixth car in the range that really stood out from a sales point of view. The TR5 enjoyed a very brief thirteen-month period of manufacture between 1967 and 1968. Less than 3,000 units were produced before the TR6 came in to improve on many of the specifications. Unlike its predecessors, the Triumph TR6 was more reliable mechanically, which means that there are many original models still on our roads.

Website: https://www.classicdriver.com/en/car/triumph/tr6/1968/723270