http://www.classicseacraft.com/20SFSpecifications.htm
Although some have special feelings for their boats being called "super fish" or whatever, it basically means that it's a center console vs. a cuddy cabin boat.
I believe mine started out as a 20 "SF".....right before the sawsall turned it into a "BC" (Blank Canvas) [img]/images/graemlins/grin.gif[/img]