CH 1939 J89-J92 Pro Juventute FDC with address (Registered mail)

Switzerland 1939 J (Pro Juventute issues)
Pro Juventute - Portrait of General Hans Herzog and Swiss women's costumes, SBK J89-J92, Michel 359-362,
FDC neutral envelope (Format C6) with address (registered letter), cancelled "1.XII.39 Luzern 1 - Briefannahme", transported to Rome IT, on the back arrival cancellation "ROMA 2.12.39", very good condition.