Errors, Freaks & Oddities (EFOs)
- Others
- Multiple EFOs per issue
EFO Catalog
1981. 40s Concert at the Park issue,
IMPERFORATE Vertically, Pair.
1985. 60s and 3p00 International Telecommunications
Satellite Organization (INTELSTAT) 20th Anniversary issue,
IMPERFORATE, Pairs.
1984. 60s Kilusang Kabuhayan at Kaunlaran (KKK) -
National Livelihood issue, IMPERFORATE right margin.
1986. 3p60 Philippine Normal College, 85th Anniversary,
IMPERFORATE Pair.
1983. 40s San Lorenzo Ruiz Beatification issue,
IMPERFORATE bottom margin.
1978. 90s Town of Balayan, 4th Centennial issue,
featuring the Balayan Church.
Double error - Missing "90s" value and IMPERFORATE.