Airmail cover postmarked Chicago, Ill., Dec. 1, 1928 (opening day) with a 'AIR MAIL / SAVE TIME' slogan machine cancel, franked with a 5-cent Beacon airmail stamp (plate number 19546), and bearing a printed purple cachet for the International Aeronautical Exposition, Dec. 1–9, 1928, Chicago; back flap torn open with light age toning. Please review the scans for condition.