I concur with Gary. I read one of Lefty's biographies (by Kaplan), and indeed his last name was Groves...but as he started to become well known (per the book, after his 4th year in the majors) most baseball publications started leaving off the "s" and I suppose he just went with it. I agree with the earlier post that the "e's" don't reflect what is seen in almost all Lefty Grove signatures, but since this was quite early and I cannot think of any other early signatrures to compare, I would lean towards saying this early signature is "most likely genuine"
