1928 Mexico Newer & B/B Covers

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

5945- 1920, REGISTERED FROM MEXICO TO GERMANY

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

5938- 1935, (1) PAIR AND (1) SINGLE ON REGISTERED COVER TO LONG BEACH, CA, PROOFS USED AS POSTAGE

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