1944, war navy, registered fieldpost letter to the Command the war navy in Berlin with postal stamp CUXHAVEN 1 from 5.7.44 and fieldpost R-slip of paper with stamp overprint "III" ( = navy field post office Cuxhaven 1) as well with service- and cover stamp army postal service no. M 27558 = command 1. Guinea pig vessel flotilla, excellent condition, Michel 200, 00