OK, I have no idea what happened here BUT...
The pictured disc is 100% for certain NOT a Cobra. Me thinks it's a Viper.
Ironically, a disc that I can't tell from a Viper in pictures is the old 90's Whippet. In person the Whippet is small diameter and the Viper is large diameter so they are easy to tell apart, but it pictures they look alike. Same tooling as well. So since you have a Whippet, you can see if they have the sameish diameter or if the Edgewood Electric disc has a noticeably larger diameter. Same diameter=old Whippet; larger diameter=Viper.