Most pairs of Oakleys can be easily determined authentic or fake by quick glance by a trained eye. However, I had one person tell me that Oakley Square Wire 2.0 have a number under the earsock to determine whether they are real or not. We all know that Oakley's process changes constantly and one thing we believe creates a standard on a particular line of shades, may be different the following year. Can anyone clarify the number under the earsock and the reasoning behind it and any information you may know?