The brand of Marc Jacobs belongs to America. However they are made in Italy because of the globalization of economy. If you want to judge whether this type of sunglasses is real or not, you can observe from the brand name printed on the frame side, the detailed manual work and the comfortable wearing feeling.
Well, first up, you should get to know that Marc Jacobs is a brand that was established in American by himself, so even though sometimes, the name sounds more Italian than American but it is actually an American brand locin the USA. As to your question, I gotta say, when t to get a parif of good sunglasses. You should make sure that you get them from the legal channel that is just the basic guarantee of thir authenticity. Also , you should be careful wsing the right sunglasses. At last, try to call the service to see if they are real.