The thing is, it's a prototype. If it were a GB it would be labeled that way, but maybe you've been talking with someone on the inside of the company who knows more about it. I think if I understand Blair correctly the proto he had was a 602 type (B20 bronze, same quality as a 602 splash) just like you believe your prototype cymbal is a GB. The only way to verify it was a GB would be to have a same-era GB (I never heard of that, I thought they were reissued several years later) and to compare the 2.
I'm only stating the logo, the Paiste black ink logo as on your cymbal indicates it is a prototype.
And this is about your cymbal only. I don't want to create some type of set of rules regarding Paiste cymbals. There are always going to be exceptions to those types of rules.
For instance, I once bought a 16" Paiste 2002 red label crash from a guy online. He sent it to me, and I looked at it, and played it, it sounded pretty good and looked great. The only problem was it actually measured 15". Kinda weird, right? Here was a (labeled) 16" 2002 crash that was really a 15" crash. And the edge was factory. Stuff happens. These are factories and mistakes get made, but back to your cymbal: If it's a '95 model it is a prototype, even if the "formula" is identical to a GB. There are other B8 cymbals it could be close to as well. I think the prototypes were a chance for Paiste to produce cymbals that either hadn't yet been labeled as a certain line, or one-offs, wherein they were creating a cymbal and it would not necessarily be produced later. That's pretty much the definition of a prototype.