>>7378403'88 and '99 were very similar, with them slowly transitioning into the 1999 one, which sole difference was that it mainly moved Geoffrey's family out of the advertising. There's artwork that predated what was listed as 1999 that looks just the same in style.
Those are also my preferred Geoffrey. They fucked up the very minute they decided to do a live action giraffe.
These Geoffrey dollars also have 1997 on them, predating the 1999 date for the even more anthro looking version of Geoffrey.