vintage Roller Derby ? WOOD SKATEBOARD Chicago Trucks and Clay Wheels

Vintage wood skateboard. From the little research I did on this unmarked board, I believe this is a Roller Derby skateboard. Any info is appreciated if I am incorrect.  24" long and 6" wide. Clay Chicage wheels on Chicago trucks. 

I am not a skateboard expert but picked up a collection of boards that came along with a bicycle collection. I'll do my best to answer any questions.