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I am not a TAG expert, so cannot say for sure.
But before even looking at the watch, some things you ought to check:
1. What can you learn about the seller. Reputable? If they have their own web site, do a Google search for other sites that mention his. If on an auction site, check his feedback.
2. The price. Unbelievably low is not a good sign. TAG is a popular enough brand that there is always someone willing to pay a fair price for an authentic one in good shape.
3. Is the seller selling multiple big name brand watches pretty cheap? If on an auction site, have you checked not only his other active auctions, but also his completed auctions?
4. Do you have a current or recent TAG catalog as a reference? Does the watch match the style and fine details of the real ones in the catalog? Or does it look inferior or have sloppy or cruder details?
5. Is the watch you are looking at an exact model that you are wanting--and would recognize in detail? That helps. If you are broadly shopping for a good deal on anything that seems like a good looking TAG, you are easier to fool with a fake because you don't know the exact details of the watch.
6. Does the seller use weasel-wording to leave loopholes in his description, dancing around authenticity and origin issues?