I've been wondering this for a while. I play the Pro V1x and I have noticed that many, but not all, are marked with 2 letters. I'm curious what these letters are about? Do they indicate which machine they came off of? Maybe where they were manufactured? Or a model number or something like that? Or maybe they just mean nothing? I have a couple of older Pro V's from 10+ years ago laying around and they don't seem to have the same thing.
Anyway, I'm curious and figured this was the right place to ask.