From 30 July 1959 to 11 October 1968,
Fernando Poo and
Río Muni were treated as overseas provinces of
Spain until they combined to form Equatorial Guinea on 12 October 1968. Fernando Poo and Río Muni originally used postage stamps of Spanish Guinea until 1960 when the Spanish government decreed the use of separate issues for Río Muni and
Fernando Po.
Fernando Po The first
definitive series for Fernando Poo as a province were issued on 25 February 1960. Issues from 1961 on added the inscription "ESPAÑA"; typically two to three issues per year, consisting of two to four stamps each, and usually depicting local plants and animals. Another definitive series appeared in 1964, also with nine values. The last issue of Río Muni was a set of three signs of the zodiac issued on 25 April 1968. ==Independence==