Due to the slow way the mail service was working at the beginning of the XIX century the directors of the mail system began to work to improve the service. Up to that moment the received mail was marked with a cancellation that only contained the city or town of origin on the envelope. The authority concluded that they will add the Date of the day it was received and the place of origin. Also was required that the back of the envelope be stamped with the date of received and the post office who received it.

  This new system of detad cancellation was adopted and approved by the RoyalOrder on May 8 1842. the General Director of Postal Services in Spain was Don Juan Baeza as it is understood , the new sytem was given the name of :BAEZA". These "dated cancellations" were imposed to the 29 Spanish provinces and its 3 colonies Cuba, Puerto Rico and Phillippines.

  Each province was adjudicated a zone number from 1 to 31 in the case of Cuba and Puerto Rico colonies, they received the same number 30 , Phillippines was adjudicated number 31.

  These new postal marks were given double circles with the name of the city in the upper and the province in lower part, in both side are the number assigned to each possession in the case of Cuba was number 30 and in the center the day, month and year.

 The markers assigned to Cuba we find two types, TYPE I, SHOWING IN THE CENTER "ISLA DE CUBA" is to observe  preposition "DE" the "E" is inside the character "D". In Type II  the preposition :DE" is in a normal way is in a normal way as seen at the beginning of this paragraph.

 Type I cancellation were the first received in Cuba, the following cities were the only ones detected: Habana, Matanzas, Puerto Principe, Santiago y Trinidad. These same cities received the II type, just as the other Cuban towns.

 "CUBA" and SGO.DE CUBA and these where 4 different types of cancellations created for these cities.

 Differents ink colors was used according with the ink available in each Post Office at that time.