Logos

I've always thought that the Riders have had three logos: the current one, the "retro" S logo and the one with the football and the wheat stalks and the banner. Someone told me that they've had 5 or 6. Does anyone know how many they've had. I have the current logo tattooed on my arm and am going to get the other's as well just would like to know if I'm right befor I start. Thanks for the help.

http://www.nationalchamps.net/Helmet_Project/