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Hi Stephan,
You really got a great find there. Does the book have provenance? The reason why I ask is that signatures are easily forged, so it is always important to have a reputable dealer authenticate the item and give you the history, if known, of where he obtained it. Have you compared it to known authentic Udet signatures? I can honestly say that the reputation of the seller has as much to do with the value of the signature as the signature itself. BTW, I have seen his signature sell for as little as $350 US and upwards ($1,000+).
regards
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