1928 Mexico Newer & B/B Covers

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

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

5941- 1933, CERTIFIED WITH 2 AIR MAIL STAMPS + 1 SURFACE STAMP TO GERMANY

5926- 1924, 1-2 YUCATAN, MERIDA TO CAMPECHE, VERT. CREASE, ABIERTA POR EL CENSOR LABEL

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