This is a 1928 Air Mail piece postmarked February 21, 1928 at 4 A.M.in Chicago, IL.. It is a one cent embossed envelope with a one cent Franklin stamp and an eight cent Grant stamp on it.  It has a special stamping on it saying "Lindbergh Again Flies the Air Mail". On the back of the envelope it has a post mark from St Louis, MO dated February 21, 1928 at 11 A.M. It is in good condition for being 86 years old. Would be a nice piece especially for Air Mail collectors.