1944, war navy, registered fieldpost letter to the navy location checkout in Wilhelmshaven with mute postal stamp from 25.3.44 and fieldpost R-slip of paper with overprint "Fp XXVI" with UB "b" ( = navy field post office Kiel 1 ) as well with service- and cover stamp army postal service no. M 17474 = destroyer Z 5 "Paul Jakobi", legitimate condition, Michel 150, 00