The first one is a 5.45 pesos registered rate (base 5.25 pesos) to the United States. It's on an Air France envelope with name of the airline covered by selvage from a 5 centavos sheet.
Postmarked en route in Miami.
A large cover bearing 9.55 pesos in postage to the United States.
Transit Cali, Colombia marking on the back.
The third cover is a 5.20 pesos rate to England.