I see what looks like a partial serif but the rest doesn't match up. Maybe just a tiny die gouge or bubble in that exact spot. It looks too far away and missing some other things it looks like. But I could see why you would ask. I've been on the look out for one. I must've had 50 88'S so far in this box I'm working on and I've had to do some double takes and closer examinations. Most of them have been polished so much in those years it's hard to even make out the initials.