I've had this disc for 8-10 years and I've always wondered what it's worth. The stamp is a Texas10 Ziegenbock Charity. The patent # listed on the back is: 4,568,297. I know that it's an Ontario disc and I'm 99.9% confident that it's a Roc. The disc is clear green...I've never really thrown it fearing that I'd lose it.
Could be a Champion Classic Roc. The came out in 2004 as tourney stamps.