On that date, theme was Évora worls heritage town by UNESCO.
To comemorate, was issued a souvenir sheet designed by Maluda a Portuguese painter.
The theme of the souvenir sheet is a well known window of this historic town.
The value is 150$00.
They were issued 100 000 and they circulated between May, 13th of 1988 and August 31st of 1995.