1939 / 40, 4 army postal service official letters with mute stamp respectively KIEL 1 from 5.12.39, 17.12.39, 13.4.40 and from 30.4.40 as well in each case with cover stamp "free by exemption providing franking privilege Reich" with army postal service no. M 20078 = leader of the Minensuchverbände east, good condition