Engineered with Vodafone McLaren Mercedes and tested in racing conditions by Jenson Button, each timepiece comes equipped with the TAG Heuer six key features: 1/10th of a second display, water-resistant to 200m, Easy grip, screw-in crown, double security folding clasp, sapphire crystal.
Replica Tag Heuer Formula 1 Chronograph on the left / Genuine on the right: Many small thing should be looked for. Date background should be black on black dial watches, not white. Date font is also a bit different. Most importently, the 1/10th indicator is often not working corectly. Some of the best fake Tag Heuer Formula 1 might have the 1/10th second working since Tag Heuer use a Ronda movement, which is easily available, in this case, the only way to know would be to open the caseback.
Replica Tag Heuer Formula 1 Chronograph on the left / Genuine on the right. Caseback is hard to identify. Serial number should be looked for. Beside that, you will have to see the actual movement to be sure it's identified as Tag Heuer and not generic