Thanks to the crew who PM'd me... yes, it is a 1968 Peter Clarke Stringerless Pintail. I found the logo first off via the Cronulla Surf Museum web page, then Google.

Unfortunately, after spending 3hrs with the 60 & 80 grit sandpaper I found that the nose section where the logo is has de-laminated and cannot be saved, so will have to cut it out and re-glass.
Other than that, I am pleased with how it has come up so far. It's not going to need a lot of glass to get her water tight again.
Thanks again for the help ID'ing the old girl - she's 50yo this year!! I'll get her back in the water for her Golden Birthday.
I'll post some more pics when she's done and looking pretty.