1959
Airmail – Unification of Airmail Rates – Overprinted “UNIFICADO”


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YQ]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YR]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YS]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YT]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YU]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YV]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YW]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YX]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YY]


[Airmail - Unification of Airmail Rates - Overprinted "UNIFICADO", type YZ]

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