Von Miller Autographed Signed Denver Broncos Logo Football COA & Hologram.This item comes certified by Signature Dog Autographs. Signature Dog offers a 100% no questions asked lifetime guarantee on every item we sell. Each item comes individually certified with a unique serial numbered certificate of authenticity along with a taper proof matching number on the item. All items we sell can be verified authentic on our website at any time. We take authenticity very serious and no one in the industry delivers top quality product with an iron clad guarantee on every item we sell.