1949
Airmail – The 75th Anniversary of U.P.U. – Overprinted “75 Aniversario U.P.U.” and Surcharged


[Airmail - The 75th Anniversary of U.P.U. - Overprinted "75 Aniversario U.P.U." and Surcharged, type YL]


[Airmail - The 75th Anniversary of U.P.U. - Overprinted "75 Aniversario U.P.U." and Surcharged, type YM]


[Airmail - The 75th Anniversary of U.P.U. - Overprinted "75 Aniversario U.P.U." and Surcharged, type YN]


[Airmail - The 75th Anniversary of U.P.U. - Overprinted "75 Aniversario U.P.U." and Surcharged, type YO]

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