1941, army postal service cover with content and mute machinery stamp from 12.11.41 as well with senders note army postal service no. M 14891 = destroyer "Z 15" "Erich Steinbrinck", the at that time at the wharf in Hamburg lay, to a Fähn. To S. in the unit army postal service no. 06153 = command 1. U boat flotilla, the in Brest stations was, good condition