For Derek Jeter, you need to talk to Christopher Williams, who is a member on this site. I would send him a message to check for sure, b/c he certainly will know. My opinion is that this is a forgery. I am not great on him, but their is one characteristic in his D's that i see in every single authentic signature, and this one lacks that in my opinion. Id check with Chris williams for sure, but if it were me id pass, i think its a forgery.