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1981 40s Concert at the Park
issue, IMPERFORATE Vertically, Pair.

1986 3p60 Philippine Normal
College, 85th Anniversary, IMPERFORATE Pair.

1985 60s and 3p00
International Telecommunications Satellite Organization (INTELSTAT) 20th
Anniversary issue, IMPERFORATE, Pairs.

1983 40s San Lorenzo Ruiz
Beatification issue, IMPERFORATE bottom margin.

1984 60s Kilusang Kabuhayan
at Kaunlaran (KKK) - National Livelihood issue, IMPERFORATE right
margin.

1978 90s Town of Balayan,
4th Centennial issue, featuring the Balayan Church. Double error -
Missing "90s" value and IMPERFORATE.
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