Offered is a vintage pair of original AMERICAN OPTICAL AO SUNGLASSES 1-10 12K GF Gold Aviator 5 1/2 Pilot.  My guess is they are from the 1940's or 50's.  The arms are clearly marked with the writing (please review photos) - 5 1/2 American Optical 12K GF.  The lens are clear and free of any issues.  They are not perfect - the plastic on the arms have some cracking but are absolutely intact.  The nose pad on the one side has a small piece chipped off.  I'm sure that can be replaced.  The arms could be tightened.  Please, review the photos for condition and description.  Ask any questions prior to purchase.  Thank you.