First Run Proto Star Orc ??? Errrr, Sidewinder ???

I just bought a box of discs from a person who no longer plays and hasn't played in a few years.
I gave more than I wanted to give but there were a couple collectable discs in the bunch as well as a brand new bag.
There is a brand new CE Eagle with some shelf wear but still in really good condition.
There is also what I believe to be a First Run Proto Star stamped Champion Orc. It is light blue with a silver stamp.
Does anyone know for certain if the Orc was ever stamped with a Proto Star?
It has the same dome and egde as well as the cut and angle on the lip.
I'm pretty sure that's what it is, I've just never seen a Proto stamp on one.
Thanks for the help guys.

[Nascar Dave]

camera phone picture, kind of distorted side view of the disc

[ROBEY the one.]

easy way to find out take a few measurements and compare to the tech standards on the pdga site for approved discs. quick and painless, more accurate then guessing. :)

[Nascar Dave]

I've been having problems connecting to the PDGA site so I sent an email earlier to Dave D. Good idea.
After comparing it further to the Orc, I don't think it is, it has a slightly different lip curve that I missed at first check.
I'm thinking it might be a Sidewinder after all and that the 150 class I was comparing it to was more domey because it was just gummy.

[Coolhand]

mini star stamp sidewinder

[Rescue]

I second the motion. 1st run Sidewinder. I'm looking at mine and I'd have to say it looks pretty close. The bottom of the rim makes me think that. The funny thing is. Mine don't have any markings on the bottom either!