Hi guys, I ask for opinions on this John Bardeen signed card which is sold by a German autograph seller called 'Eberhard Köstler Autographen&Bücher oHG' on abebooks, Anyone heard of them? I am interested in collecting autographs of scientists and John Bardeen is a famous physicist who was awarded Nobel Prize in physics twice. After my own research, I think this one is genuine, But I ask for your opinions. Thanks!

