Quick help with a original signed letter by A.H

[schönbeck]

HI
I have just been offered to buy a letter, personnally signed by Hitler.
You can follow the letter back to a swedish farmer who was a member of the swedish farmer association, this was a sister party to the german national sozialistche partei.
His own sketch of the letter to Hitler also follows.
The letter is dated 1933, no hitlerstamp just a regular.
The AH signature is authenticated.
What is a good price for this item?

[Volkbert]

Have not an exact idea. For comparison: I saw a picture of Hitler with his signature for sale at Detlev. He asked €1000 for it.