How old is your son's watch?
The warranty card in your picture looks to be the current style. TAG Heuer changes the look of their warranty cards every few years. So if your son's watch is something like 5 years old, they probably couldn't get the exact same card as a replacement any more.
The main thing is that it has a valid warranty number on the back. The serial number is usually hand written on the card by the authorized dealer, along with the date of purchase.
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