5c orange 'Fernandez' issue of 1910 with 'ALMIRANTE OCUPACION COSTARRICENSE' overprint in purple tied on large piece by ADMON DE CORREOS ALMIRANTE cds dated MAR 5 1921. This overprint was issued unofficially by the Costa Rican military force that entered and occupied Almirante in Panama on 4th March 1921. Very rare.