no clue really on GTSM, but if Reggie Bush is signing to that company exclusively for his autos, it has to be SOMEWHAT reputable right?
anyways, i know that GAI is reputable, but i really only trust it if the serial number starts with GP. GP = someone was present when the athlete signed. there is also GV which means that GAI verified the auto. personally, i only buy if its GP, but to each their own
GAI is fine, the other one? Well, looks like he is creating new busines ventures... if you see them there 'authenticating' guess you'll have to live with it... hint, take your own pics