Just like the Senate election where the Nacionalista Party and the Liberal Party split even the disputed eight seats, both parties won one seat each; the Liberals picked up the Batangas seat, while the Nacionalistas held the Negros Occidental seat.
Electoral system
All seats in the House of Representatives were elected from single member districts, under the first-past-the-post voting system. Under the Revised Election Code, when a seat becomes vacant prior to ten months before the general election, the president, as soon as he is notified by the chamber where the vacancy occurred, shall call a special election.
Incumbent Apolinario Apacible died in office, necessating a special election. Apacible had won four consecutive elections prior to his death. His brother Quirino was one of the candidates of the Nacionalista Party.
1963 Batangas's 1st congressional district special election
Incumbent Vicente Gustilo Sr. died in office, necessating a special election. Gustillo won in 1957, then defended it on 1961, before dying in 1962. His son Armando was the Nacionalista candidate.
1963 Negros Occidental's 1st congressional district special election
The winners of these special elections were known to be connected to the sugar industry.
In Batangas, the Nacionalistas wrestled back the seat under Federico Serrano, son of Felixberto Serrano, who won the 1965 general election. He was then succeeded by Roberto Diokno in 1969, who then held the seat until the proclamation of martial law in 1972.
In Negros Occidental, Armando Gustillo held the seat until the proclamation of martial law in 1972.
References
1 2 Report of the Commission on Elections to the President of the Philippines and the Congress. Manila: Bureau of Print. 1965. p.538.
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