1913 Mexico Newer & B/B Covers

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

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

5951- 1935, PORT OF CALL, LA PAZ, U.S.S. CUSHING

5952- 1938, PORT OF CALL, MANZANILLO, U.S.S. POMPANO

5943- 1867 GUADALAJARA PROV. TO ZAPOTLAN