Thanks for all the feedback so far.

I'm in the middle of sunny Scotland - near the coast and a
watersports loch (more likely initial venue). Grateful for the
unexpected offers of kit, but the costs involved wouldn't be a
barrier to me buying better kit if/when windsurfing was something I
was going to "do". I'd rather see free kit going to someone with
interest/promise who's progress is limited through lack of cash.

For now, I'll be happy if I can have a go/have a laugh with this free
board, fully aware of the limitations and how it is not
representative of the latest gear. After all, the guy who first owned
it went on to greater windsurfing things ...

Seems like the only issue I really need to resolve right now is the
missing fin. I'm willing to go hunt one down, but what am I looking
for? Is my description (255 x 10mm slot, ascii-wise =[]======[]= ) of
a "classic box" or something else?

You guys rock =:)

Stewart