A 1961 Commemorative Envelope with text: "Flown on One of the Last Flights of U.S. Navy Airships...1921-1961, 40th Anniversary, U.S.N.A.S. Lakehurst, N.J." Posted with two commemorative stamps celebrating the 50th anniversary of U.S. Naval Aviation. An extra bonus is a Lakehurst newsclip inside the envelope speaking to the 20,133 envelopes mailed on Sep 13, 1961. Excellent, clean.