I just e-mailed the guy that was posting the info in that thread and he has already emailed me back, but it only adds to the mystery! He seems to think it's an Orc or Valkyrie. I've thrown the disc a few times and it seemed more overstable than either an Orc and especially a Valk. It actually flies very similar to my Champ Starfire. I have a Pro Orc and a Champ Starfire that I can compare it to at home. If it is an Orc it is the most overstable one I've ever thrown because the disc has absolutely Zero turn to it, which is why I was thinking Starfire was a good answer.
Here's his email:
Hi Joseph,
I think the best I can do is narrow it down a lot. I went back in my files to look and see what the Waterloo Club ordered for that tournament – and I did the ordering so I've still got those files J
We had 2 stamps that year. In the main stamp, we only had one type of disc in champion plastic.
For the secondary stamp, which this one is, we had two types in champion plastic: Orcs and Valkyries.
If you can have someone who knows discs better (I'm not really good at looking at rims and such and telling the difference) then they might be able to check out the disc and distinguish between an Orc and a Valkyrie.
Hope this helps,
Gordon