5997- 1928, 15 APRIL, SEE PHOTO, LIGHT PURPLE CACHET

5998- 1928, 15 APRIL, SEE PHOTO, BLACK CACHET

6008- 1928, 1 OCTOBER, SEE PHOTO, BLACK CACHET

6009- 1928, 1 OCTOBER, SEE PHOTO, PURPLE CACHET

6012- 1928, 12 JULY, SEE PHOTO, PURPLE CACHET

6021- 1928, 15 APRIL, SEE PHOTO, PURPLE CACHET

6025- 1928, 15 NOVEMBER, SEE PHOTO, PURPLE CACHET

6027- 1928, 7 APRIL, SEE PHOTO, PURPLE CACHET

6004- 1929, 9 MARCH, SEE PHOTO, BLACK CACHET

6005- 1929, 9 MARCH, SEE PHOTO, DARK PURPLE CACHET

6006- 1929, 9 MARCH, SEE PHOTO, PURPLE CACHET

6007- 1929, 9 MARCH, SEE PHOTO, DARK PURPLE CACHET

6014- 1929, 16 DECEMBER, SEE PHOTO, PURPLE CACHET

6016- 1929, 16 DECEMBER, SEE PHOTO, PURPLE CACHET

6017- 1929, 15 DECEMBER, SEE PHOTO, PURPLE CACHET

6019- 1929, 15 MAY, SEE PHOTO, PURPLE CACHET

6020- 1929, 13 JUNE, SEE PHOTO, PURPLE CACHET

5936- 1930, WITH FIVE DIFFERENT REVENUES USED AS POSTAGE

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

6010- 1930, 20 APRIL, SEE PHOTO, BLACK CACHET

6011- 1930, 20 APRIL, SEE PHOTO, PURPLE CACHET

5999- 1931, 5 DECEMBER, SEE PHOTO, LIGHT PURPLE CACHET

6000- 1931, 19 JAN, SEE PHOTO, LIGHT PURPLE CACHET

6001- 1931, 22 MAY, SEE PHOTO, PURPLE CACHET

6002- 1931, 15 MAY, SEE PHOTO, PURPLE CACHET