This is the signature of Albert Speer (1905-1981) who was not only Hitler's architect, but also Minister of Armanents. I suppose it was the second job that landed him in prison for 20 years, where he wrote a book I have for sale elsewhere in my site. I saw a History Channel special on Speer the other night. They said that if they knew in 1946 what they know now Speer would have been hung! He was directly responsible for 1000's of deaths! Notice the Frank Lloyd Wright stamp on the envelope - another less infamous architect. CLICK THE IMAGES TO MAKE THEM MUCH LARGER.