Board is definitely mid to late 70's based on the description of the fin system you described. As far as serial numbers go they really don't have a huge amount of significance. The value of the board is prolly around $100-$150. If you like it then just keep it.
Thanks for the replies guys. There is no signature kidrock, I'll check out what that surf shop thinks too.
Dang Slade, I'm figuring $300-$500. It's 40-45 years old and in good shape. I have never seen anything like it and I've been fondling surfboards for like 30 years.
Braddy, you don't think that thing, de-waxed and shined up, would look cool, strategically placed in one of the rooms in your trailer?
maybe as a wall unit …..but, no. thanks for asking but guys like me - in a fevered search for the holy grail
of the hpsb - worked hard to put those kind of boards behind us. when the 'retro thing' showed up i gagged then
learned to zip it cause nobody wanted to hear it…ever hear the song mute witness? (she's only trying to tell you
what it was that she saw)…...