Is your PRX Chrono
the real deal?
The Tissot PRX Chronograph adds a 42mm automatic chronograph to the hugely popular PRX line. Featuring the integrated bracelet design that made the PRX famous, plus three sub-dials and the Valjoux A05.H31 movement with 60-hour power reserve, its ~$1,500 price point and viral popularity have made it a counterfeit target.
How to authenticate a PRX Chronograph
Integrated Bracelet
Seamless case-to-bracelet transition, matching finish on all surfaces. The bracelet links should articulate smoothly with no gaps at the junction. The integrated design is the PRX's hallmark and counterfeits consistently fail to match the precise fit.
Dial & Sub-Dials
Three registers at 3, 6, and 9 with correct proportions, date window integrated into the 6 o'clock sub-dial. Each sub-dial should be properly recessed with clean printing. The hands should be correctly proportioned for each register.
Case Size
42mm — larger than the standard 40mm PRX, with more complex case construction to accommodate the chronograph movement. The additional thickness should feel proportional. Counterfeits often use the wrong diameter or have poorly proportioned cases.
Movement
Valjoux A05.H31 automatic chronograph with 60-hour power reserve. The display caseback shows the decorated movement with column-wheel mechanism visible. The rotor should be branded "TISSOT" with proper finishing. Counterfeits use cheap movements with different layouts.
Pushers & Crown
Round chronograph pushers at 2 and 4 o'clock positions, crown at 3 with Tissot T logo. The pushers should have a crisp, defined click when pressed. The crown should feature a sharply engraved T logo and operate smoothly with defined positions.
Crystal
Sapphire crystal with anti-reflective coating on both sides. The crystal should be perfectly clear with no distortion and highly scratch-resistant. Counterfeits often use mineral glass which scratches more easily and lacks the clarity of genuine sapphire.
PRX Chronograph counterfeit warning signs
Non-Functional Chronograph Sub-Dials
All three chronograph registers should function correctly — the seconds, minutes, and hours sub-dials must all operate when the chronograph is engaged. Decorative-only sub-dials are a clear sign of a counterfeit.
Bracelet Gaps at Case Junction
The same issue as standard PRX fakes but even more common on chronograph counterfeits. The integrated bracelet should flow seamlessly from the case with no visible gaps, steps, or misaligned surfaces at the junction point.
Wrong Case Diameter
The PRX Chronograph should measure 42mm, not 40mm like the standard PRX. A chronograph-styled PRX at 40mm is likely a counterfeit that used the wrong case size. The additional 2mm accommodates the chronograph movement.
Missing Display Caseback
The genuine PRX Chronograph has a transparent display caseback revealing the Valjoux A05.H31 movement. A solid caseback on a watch claiming to be the PRX Chronograph is a major red flag — it's likely hiding an inferior movement.
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Frequently asked questions
How is the PRX Chronograph different from the regular PRX?
The Chronograph is larger (42mm vs 40mm), thicker, and features three chronograph sub-dials plus date. It uses a completely different movement — the Valjoux A05.H31 automatic chronograph instead of the Powermatic 80 time-only movement.
What is the Valjoux A05.H31 movement?
It's an automatic chronograph movement with a 60-hour power reserve, based on the ETA/Valjoux 7753 architecture. It features a column-wheel chronograph mechanism, which is unusual at this price point.
Is the PRX Chronograph a good value?
At approximately $1,500, it offers an automatic chronograph with column-wheel mechanism, integrated bracelet design, and Swiss Made quality — features that typically cost $3,000-$5,000 from competitors. This value proposition is precisely what makes it popular and, unfortunately, counterfeited.