1867 Mexico Newer & B/B Covers

5930- 1918, CANANEA, SONORA TO NOGALES, WITH BACK STAMP, 5¢ POSTAGE DUE USED AS POSTAGE. NO BACK FLAP

5933- 1915, ON PIECE (2) #435, WITH POSTAGE DUE 4¢

5946- 1935, REGISTERED, (2) 10¢ AND (2) .20¢ PROOFS USED AS POSTAGE, FROM MEXICO TO LONG BEACH, CA

5948- 1938, PORT OF CALL, AT SEE OF ACAPULCO – U.S.S. POMPANO

5937- 1930, REGISTERED (2) #671 ON COVER, MONTERREY TO AUSTRIA