RED OVERPRINT on 1 REAL GREEN
1878 DERECHO JUDICIAL REVENUE

Issued on January, 1881
Scott #127
Overprint on Warren #93

Inverted
Overprint
a

Double Overprint
One Inverted
(Pinchot Certificate)

Double Overprint
Both Inverted
a

Inverted Overprint
on Right Stamp

Double Overprint on Right Stamp
(APS Certificate)
The first "surcharge" issued was not in fact a surcharge, as it did not alter or restate the face value or denomination of the stamp to which it was applied. The "overprint" applied, "Habilitado Para Correos", did however, alter its use. The overprint effectively translates to "Made Valid for Postage."

This overprint was set up on a printing press. Several basic types have been identified, but the letters used are not always the same type. It is believed there may exist as many varieties as there were stamps in the sheet.
 

Inverted Overprint on Top Stamp
(Left Vertical Pair)

Inverted Overprint on Right Vertical Row
(APS Certificate)