It's always the handwritten signature, coupled, with the potential of its "Appreciated Values" that matters to the market of investors, and collectors.
Collectors can only receive a (signed) Certificate Of Authenticity from me after purchasing a single or collection of autographed poetry artworks via the link to my Google Site offerings below.
Stanley's Autographed Poetry Art Directory:
Federal Trade Commission:
Stanley Mathis @ Wix
Stanley Mathis @ Fine Art America