Collectible Cobalt Blue Airfield Runway Light Cover Lens. The Cover Lens measures approximately 5" Tall x 4 1/4" in Diameter Across the Bottom. On the Top of the Lens there is a K with a Circle Around it and says, AP3522-3-B, Made in U.S.A. In Great condition, no chips or cracks. On the Bottom inside Edge it is Rough about 1/2" Long.