1929 Mexico Newer & B/B Covers

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

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

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

5950- 1935, PORT OF CALL, MAZATLAN, U.S.S. WORDEN

5945- 1920, REGISTERED FROM MEXICO TO GERMANY