Charles Lindbergh Signed Envelope 21 Feb 1928 ''Spirit of St. Louis'' Stamp and Postmark Flown

Fine cover was opened, expect edge tears. Lindbergh Signature and handwriting lower left edge below his postmark. The pilot of the Spirit of St. Louis and Pulitzer Prize winner signs this envelope from 1928 Envelope signed: Via "Lindbergh" Air Mail . Detroit Surety Company  envelope, postmarked Chicago Illinois . February 21, 1928