Andreas Wiemer Historical Autographs sells all his items with a Certificate of Authenticity (COA) . We are proud of our autographs and we are sure - authenticity is the most important part in collecting autographs. Our COA has a unique reference number, a picture of the autograph with a short description, signed by Andreas Wiemer and without time limit. It is my opinion that a COA is important, but in all cases it is more important to know the source. I'm a member of all major autograph organizations around the world. I have a reference library with more than 100 books about autographs, a reference file for all United States Presidents and History-Makers with thousands of signatures. I wrote articles, autograph-studies and reference-books - please check my reputation and let us work together.