Tissot PRX: how a 1978 design became a modern classic

Tissot · PRX Powermatic 80 40 mm

The model in detail

Meet the watch

The PRX has a quality rare among accessible Swiss watches: you recognize its silhouette before reading the dial. The flat case flows into the bracelet without conventional projecting lugs. On the wrist it feels like one continuous object, and that shape is the right starting point for discussing the model's value.

The story is more interesting than simply calling it a watch from 1978. According to Tissot's archive account, the 1978 design belonged to the water resistant Seastar line and did not yet bear today's name. PRX had previously named another sports model. Tissot revived the modern collection in 2021, keeping the distinctive late seventies shape.

We are looking at one specific version: the blue PRX Powermatic 80 on a steel bracelet, reference T137.407.11.041.00. Its 316L steel case is 40 mm wide and 10.93 mm thick, with a sapphire crystal coated on its underside, a date display and a transparent back. Rated water resistance is 10 bar. These numbers belong to this reference, not to every PRX.

Details and limitations

The mechanical reason to choose this version is its automatic Powermatic 80 with a Nivachron balance spring and a stated reserve of up to 80 hours. A fully wound watch can be left off over the weekend and worn again. If it was only partly wound, do not count on all 80 hours. The display back lets you see the movement itself, a welcome detail if what happens inside matters to you.

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The integrated bracelet creates an unbroken line from case to links. This version uses steel, a butterfly clasp and a quick release system. Still, try the watch on: the 40 mm case and the first links together determine how it sits. Tissot's stated 39.5 mm is the case length on its product page, not a measurement from one end of the bracelet to the other.

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Where is the PRX's real value? In coherent design with a documented history, paired with an 80 hour automatic movement, sapphire and a steel bracelet suitable for daily wear. You also pay for a recognizable shape; power reserve alone is a poor way to compare prices. PRX comes in other sizes and quartz variants, so general opinions about 'the PRX' do not replace a comparison of exact references.

Before buying, I would check three things: the fit after sizing the bracelet, how the clasp feels and whether the blue dial appeals in normal light. If you want more strap freedom or a lighter watch, compare nearby versions. A seventies design does not guarantee collectability or resale value; enjoyment of the actual watch matters more than promises of appreciation.