This.75x3 Handwriting Sample Document has been Personally written by Isaac Newton. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website. This item has been professionally framed to overall dimensions of approximately 34.5 x 34.5 inches. This handwriting sample is also authenticated and encapsulated by PSA/DNA.