"Air Post Series"
Issue date: 1929 – 1934
The stamps are existing with dfferent perforations, watermarks and various overprintings.
The stamps show the Popocatépetl (left) and Iztaccíhuatl (right).
A five Cent in orange is existing as well. It is known as proof.
The following six stamps are existing rouletted 13:13½.
The following three stamps are existing with perforation 10½:10
Stationery, 10 Cent, 15 Cent