Los-Nr. 6067

Undercover Mail via P.O. Box 506: 1941, 15.3., cover from Portugal franked with 1,75$ (damaged) addressed to Denmark, with German censor tape of Munich on reverse, this letter used the undercover route and was sent from Faroe Islands to Thomas Cook & Son in London and then sent to their agent in Lisbon, Portugal. The letter was then sent to Aage Foldspang in Denmark. In addition, a similar letter, franked with a pair of 50 on 5ø and Numeral 5ø from "THORSHAVN 17.4.41", with the same sender and recipient, sent in the short period when the route to Denmark was open, providing proof that the letter sent from Portugal contained a letter from Faroe Islands