Extensive Third Reich stamp collection with some post war

A large personal collection (of a Herr Hans Dormann) including many unusual and rare first day covers, stamps and regions as well as an album filled with Third Reich and post war era German postal and FeldPost stamps.
 
It appears as though during the war this collector had military and / or civil service friends and family sending him these from various regions including one fascinating Soviet card sent during Operation Barbarossa.