William J. Sparks-Vintage Signed Notecard (Chemist at Exxon & Inventor)

Description

(1905–1976) Vintage 3.5x5.75 notecard signed on both sides in blue ink by William J. Sparks. In good condition with small tears to the surface of the card. William Joseph Sparks was a chemist at Exxon. As an inventor, his most important contribution was the development of butyl rubber.
Comes with a full Letter of Authenticity from Todd Mueller Authentics if the item sells for and over.  Items that sell for less than will get an authentication hologram sticker on the back of each item from Todd Mueller Authentics and a 3x3 authentication card.