(EDIT. Oops, the following was supposed to go in the thread about the Goo'chee tie, but am too lazy to move it.)
Unless you plan to wear it backwards, so that the Gucci logo shows, and assuming you like the tie, why would you care about either the brand or it's authenticity? (Says the man currently wearing a favorite tweed made by the not to be spoken of in good company maker, Haggar, probably in a Mexican chicken house.)