1929 Mexico Newer & B/B Covers

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

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

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

5934- 1914, #386, WITH POSTAGE DUE 2¢ PAID, WITH #385, TO NOGALES

5931- 1915, INTERESTING POSTAGE DUE COVER, .10¢ PAID WITH #348