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


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


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


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


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


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


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


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


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


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


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

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