The area that arches up over the nose between the lenses. It looks like Musehead has moved on from the Ray Ban Musehead Expert thread and I can't find a thread which is devoted to Aviator Authenticity. So here goes: - please only post comments related to Authenticity Tips for Aviator versions - if possible please include the year the item was first and last manufactured - please be specific with tips - if possible, describe identification differences model year to model year - please recommend resources or links to expert references - please post images detailing the tip Note: I've done quite a bit of research online and find a lot of conflicting information. Common Terms: Bridge: The bar which arches over the nose between the lens frame. Top Bar: The bar which runs across the top of the bridge. Temple (arm): The piece which extends from the frame to the ear.