'UN PESO' on 2p 50c brown postal stationery notification envelope (H&G NB2) with 'CORREOS NACIONALES SERVICIO INTERIOR' overprint in black (Guatemala Handbook Type C). A fine used example with 'INSPECCION DE CARTEROS DE CERTIFICADOS ADMINISTRACION CENTRAL GUATEMALA' cds dated FEB 2 1930 in purple on reverse. Sent locally within GUATEMALA CITY.