The 15th anniversary of the Philippine Republic was marked by the release of a set of stamps overprinted in Filipino. The Bureau of Posts chose the 1959 Manila Conference stamps to be overprinted:
IKA15
KARAWAN
Republika ng Pilipinas
Hulyo 4, 1961
15th Anniversary Republic of the Philippines, July 4, 1961
First Day of Issue Cancellation
First Day Covers