American First Day Cover Society Devoted to the advancement of First Day Cover collecting 92nd Fund Raising Auction Index | Previous | Next 177 Lot # Scott # Date Description Sug. Bid Miscellaneous 1970s 177 Event   Group of 6 ‘Milestones of Flight’ event covers from Smithsonian Institution National Air and Space Museum, from Dec. 1972 to July 1973, commemorating anniversaries of historic firsts in aviation, with various postmarks, label addresses, all with enclosures $60.00 Index | Previous | Next