Which Tissot PRX should you buy? 35mm vs 40mm, quartz vs Powermatic 80 (2026)

For most people, the best Tissot PRX is the 40mm Powermatic 80: the automatic version, which winds itself and runs for up to 80 hours off the wrist. For smaller wrists, the same watch in 35mm. For less money, the 40mm quartz has the same case, bracelet and sapphire crystal.

Every watch here is sold new by Goldsmiths, a UK authorised Tissot retailer. Prices are Goldsmiths' own on the date shown.

How we chose

We went through every PRX Goldsmiths has in stock, more than 50 of them, and read Tissot's own product pages for the measurements that matter: diameter, thickness and weight. The guide answers the two questions everyone asks (which size, and quartz or automatic), then covers the versions worth stretching to. We earn a commission if you buy through our links, which never changes the price you pay. For the rest of Tissot's range, see our best Tissot watches.

Every PRX size, compared

Thickness and weight are from Tissot's website (weights on the steel bracelet, or titanium for the 38mm). Every one is water resistant to 100 metres and has a sapphire crystal.

35mm or 40mm?

This is the big decision, and it's about your wrist, not about whether the watch is "men's" or "women's". The PRX has a wide, flat case that flows straight into the bracelet, so there's no strap to soften the edges: it wears bigger than its number suggests.

• Under about 17cm (6.7in) around the wrist: the 35mm looks right, and many men choose it for the 1970s proportions.
• About 18cm (7in) and over: the 40mm fills the wrist better.

Not sure of your wrist size? Our watch size calculator shows how to measure it in a minute.

• In between: both work. The 35mm is more vintage; the 40mm more modern.

The difference in the hand is real, too: Tissot gives 104g for the 35mm automatic and 138g for the 40mm.

Quartz or Powermatic 80?

The quartz PRX runs on a battery: it's the most accurate and the least expensive, and it's slightly thinner (10.4mm against 10.93mm in the 40mm size). The Powermatic 80 is automatic: a weight inside winds it as you move your wrist, and it keeps going for up to 80 hours off the wrist, so it's still running on Monday if you take it off on Friday evening. Goldsmiths' description of the 35mm also mentions its Nivachron™ balance spring.

You can see the difference on the dial, too: the Powermatic 80s we checked have Tissot's waffle (or "honeycomb") pattern, according to Goldsmiths' descriptions.

Our advice: if the budget stretches to the Powermatic 80, buy it. It's the version that feels like a proper Swiss watch, and an automatic never needs a battery. If it doesn't, the quartz has the same case, bracelet, crystal and water resistance, and loses nothing in looks.

The best PRX overall: Powermatic 80, 40mm

The PRX at its best: the automatic Powermatic 80 movement, a blue waffle-pattern dial, a sapphire crystal and an interchangeable steel bracelet, according to Goldsmiths' description. Tissot gives it a thickness of 10.93mm and a weight of 138g.

Best PRX overallTissot PRX Powermatic 80 T1374071104100 · 40mm · Automatic · 100 m water resistant £640Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The same watch comes in other colours, including green and black, at the same price, so choose the one you like best.

Tissot PRX 55 watches at Goldsmiths, £290 to £1,875. Shop the PRX

The best 35mm PRX: Powermatic 80 in ice blue

The 35mm automatic is the one we'd choose for most wrists under 17cm, and it's sold as unisex. Goldsmiths' description calls the colour ice blue and mentions the waffle dial, the Nivachron™ balance spring and a triple-blade folding clasp. Tissot gives 10.93mm thick and 104g.

Best 35mm PRXTissot PRX Powermatic 80 T1372071135100 · 35mm · Automatic · 100 m water resistant £640Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The best value PRX: quartz, 40mm

The least expensive way to get the full-size PRX look. Goldsmiths' description says it's a Swiss quartz watch with a sapphire crystal, water resistant to 100 metres, on an interchangeable steel bracelet. It's the thinnest 40mm PRX, at 10.4mm according to Tissot.

Best value PRXTissot PRX T1374101104100 · 40mm · Quartz · 100 m water resistant £335Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

In 35mm, the quartz PRX is even slimmer: 9.6mm and 97g, according to Tissot. This green version has Super-LumiNova® on the markers, according to Goldsmiths' description.

Tissot PRX T1372101108100 · 35mm · Quartz · 100 m water resistant £335Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The best PRX for slim wrists: 25mm

The smallest PRX, and a genuinely small watch: Tissot gives 25mm across, 9.05mm thick and just 65g. Goldsmiths' description says it has a quartz movement with an end-of-life (EOL) function, which tells you when the battery is running low, plus a sapphire crystal and 100 metres of water resistance.

Best for slim wristsTissot PRX T1370101111100 · 25mm · Quartz · 100 m water resistant £305Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Worth stretching to: titanium, Damascus and carbon

These three are automatics with an 80-hour power reserve, according to Tissot, in a 38mm or 40.5mm case made from something other than ordinary steel.

Titanium (38mm). The lightest PRX on a bracelet: Tissot gives 84g, against 138g for the 40mm steel automatic. 38mm sits between the two main sizes, so it suits a wide range of wrists.

Lightest PRXTissot PRX T1378074404100 · 38mm · Automatic · 100 m water resistant £795Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Damascus steel (38mm) has a case with the swirling pattern of Damascus steel, on a calfskin strap, and Carbon (40.5mm) has a black carbon case on a rubber strap; Tissot gives 75g for each.

The PRX chronographs

There are two. The 41mm quartz chronograph uses Tissot's G10.212 quartz movement, according to Goldsmiths, and is 11.65mm thick according to Tissot.

Tissot PRX Chrono Quartz T1374171104100 · 41mm · Quartz · 100 m water resistant £430Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The 42mm automatic chronograph is the top of the steel PRX range. Goldsmiths' description says it uses the Valjoux A05.H31 movement, with the classic three-counter layout. Tissot gives a 68-hour power reserve, a thickness of 14.54mm and a weight of 184g, so it's a much bigger watch on the wrist than the three-hand PRX.

Best PRX chronographTissot PRX Chronograph Automatic T1374271104101 · 42mm · Automatic · 100 m water resistant £1,695Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The gold PRX

Most gold PRX watches are stainless steel with a yellow gold PVD coating: a durable gold-coloured finish, not solid gold. This 40mm quartz version is the least expensive.

Tissot PRX T1374103302100 · 40mm · Quartz · 100 m water resistant £425Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

At the top of the range, Goldsmiths sells two 35mm Powermatic 80s with real gold: one with 9ct yellow gold accents and one with an 18ct rose gold bezel, a mother-of-pearl dial and a see-through case back, according to Goldsmiths' descriptions.

Tissot PRX or something else?

If you like the PRX's integrated-bracelet look but want something different, the Citizen Tsuyosa is the automatic it's most often compared with, at a lower price. See our best automatic watches under £500. If you'd rather have a classic round watch from Tissot, the Gentleman is in our best Tissot watches.