Nobody has mentioned it yet and I don't know (and I don't care if they're legal or not but mine has a bunch of numbers and the word Chromance and also Ray-Ban logo on it printed on the inside of the sheet. It's very small and I think someone who sells fakes might not bother to print it there. Again, I'm no expert and haven't done any research, but maybe someone knows if whether this print matters or not anyways love these sunglasses!