Steve Zarelli Space Authentication is pleased to present an online signature study on NASA astronaut, Virgil "Gus" Grissom. The full study can be found on my website by clicking here. I have included a number of verified signature exemplars that span the short period Gus Grissom was signing autographs, as well as Autopens, secretarials, pre-prints and suspected forgeries. In my estimation, Grisso…