Wikipedia>Mabuhay1946
Based from the [https://nhcp.gov.ph/1985-a-year-of-three-shades-of-blue/ NHCP], the blue was "Cable No. 70077 (TCCA) or Cable No. 80077 (CAUS)" known as "National Flag" blue ([https://www.colorassociation.com/color-names Color Association of the US])
m