Los 5221
1940, 3.4., cover from Copenhagen addressed to Thorshavn, but due to interrupted service returned with purple "Postudvekslingen indstillet retur afsenderen"; due to the lack of a return address opened by the post office and re-sealed and re-sent when a route opened later that summer with German censor mark "Ae" of Frankfurt and English censor label "P.C.90"; a scarce and interesting cover
