Hot Stuff 5 fin

I was wondering if anyone out there could help me with a query. Recently I found a HotStuff board with a 5-fin(glassed on) set up with channels/swallow tail. The board is 5’11" x 20" x2.75". It was in bad shape so I’ve had it restored(gracias Lulen) but now would like to know the history. I place it as made in the early eighties. It was shaped(according to the sticker on it) by a Bill Walters in Narrabeen Australia.

It has no writing on the foam apart from a “bw” at the rear of the deck.

Any ideas?? Australia to Spain is a long paddle