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1961 Airmail – Overprinted “AEREO” or Surcharged

1961 Domestic Express Airmail – The 50th Anniversary of North Santander

1961 Airmail – The 50th Anniversary of North Santander

1961 The 50th Anniversary of North Santander

1961 Airmail – The 50th Anniversary of Valle del Cauca

1961 The 50th Anniversary of Valle del Cauca

1961 Airmail – The 75th Anniversary of the Birth of Alfonso Lopez, 1886-1959

1961 Domestic Express Airmail – The 75th Anniversary of the Birth of Alfonso Lopez, 1886-1959

1961 Airmail – The 75th Anniversary of the Birth of Alfonso Lopez, 1886-1959

1961 The 75th Anniversary of the Birth of Alfonso Lopez, 1886-1959