1944, war navy, army postal service R cover to the Command the war navy in Berlin with mute postal stamp from 02.7.43 (Stamp error, there arrival postmark 04.8.44) and fieldpost R-slip of paper with overprint "Fp XXVI" with UB "b" ( = navy field post office Kiel 1 ) as well with senders note Navy-post office / Hamburg and with service- and cover stamp army postal service no. M 42766 = command 5. U boat flotilla, good condition, Michel 150, 00