Yes, every Tag Heuer watch has a unique serial number, which is why it is one of the best ways to check authenticity. However, if a counterfeiter has gone to the effort of creating a convincing replica, it is not difficult to engrave a few letters and numbers onto the back of it.

It's popular to hate on them because they're popular (the two luxury brands most people can even name) and since they aren't bought by the most discerning of consumer, stuffy enthusiasts turn their nose up at them. Tag turned themselves into the “Nickleback” of watches with cheap watches posing as luxury offerings.

While not all TAG Heuer watches hold their value, as well as some luxury counterparts, the brand's iconic models and vintage pieces have demonstrated stronger value retention. The Monaco, Carrera, and Autavia stand out as examples of watches that generally hold their value better within the TAG Heuer lineup.