Lot
1897 
Smithsonian Milestones of Flight, 1972-1981, #1-100, complete set of covers, celebrating the important occurrences in the history of flight as commemorated by the National Air & Space Museum; also including a duplicate set lacking only #1 and including some miscellaneous other duplicates; excellent condition, complete set difficult to assemble. Estimate $200 - 300.
Realized: $100