Some of the stamps printed for the "SERVICIO OFICIAL" issues are either very rare or do not exist without the overprint. The block of four of the 5cM stamps shown below are a color shade that is not found in the regular issue. In this page, I also show examples of the 10cBR and 15cMG "SERVICIO OFICIAL" issues.

Below is a block of four o fthe 10cBR "SERVICIO OFICIAL" issue

Below is a block of four o fthe 15cMG "SERVICIO OFICIAL" issue