Hey Paul,
I thought I'd send you these pics of an infamous surfcraft of yesteryear. I'm sure you've seen one in your travels. (I'll bet most prone-riders haven't!) I'm talking 'bout the lowly Captain Swim-Surfer!
Is it a surf mat? Not quite...
Is it inflatable? Kind of...
Is it totally indestructible? Just about...
Was it developed by mad chemists, with a keen sense of advanced hydrodynamics? Perhaps...
Long discarded in surfing history's pile of flotsam, I say this funky relic deserves another serious look!

3/4 view, showing concave deck, and "chine" transition rails.

Logo shot - still intact!

Rear view, showing drain plug and -- WOOOPS!!!! -- UNION CARBIDE???
I bet they wish they would've stuck to making these, rather than offshoring their pesticide refineries. (Remember Bhopal?)

Bottom view rear - dig the subtle keel fin!

Bottom view front - It appears that all the rocker is in the hulled bottom profile, while the S deck remains quite flat - up onto the rolled hips....hmmm.... And what of those concave nose pockets? It's almost as if Simmons had a hand in the design of this thing!