1929 Mexico Newer & B/B Covers

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

5944- 1867 GUADALAJARA PROV. TO GUADALAJARA TO ZAMORA

5936- 1960, #909 ON FIRST DAY COVER, NICE AND CLEAN

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

5936- 1930, WITH FIVE DIFFERENT REVENUES USED AS POSTAGE