In 1778 Spain received certain territories under the Treaty of El Pardo, and the Count of Argelejo left Buenos Aires in April of that year to take possession of them. His arrival at Fernando Poo in October 1778 in the frigate Catalina, with two other ships, is the subject of the 5 pesetas stamp design. They arrived at a small bay which they named San Carlos. The Count is the figure on the left-hand side of the stamp.
Sea Breezes Sept 1951. Spanish Guinea SG330