Los 6074
Undercover Mail via P.O. Box 164: 1943, 30.6., registered airmail cover sent from "LISBOA 30 JUN 43" to Denmark, with German censor mark and Danish censor label. This cover included a letter sent from Ernst Hansen, Faroe Islands via Viggo Beckmann to Arne Rueløkke Hansen in Denmark. There are only known a few letters sent to Arne Rueløkke Hansen in Denmark via undercover address in Portugal, very rare and attractive
