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Might be 1978Unpossible! Alkali invented that template! No one was placing fins that far back until recently!
According to Geoff, Fluid Foils was a decal/label used by Shane Surfboards from about 1977-8 for models shaped by Jim Pollard, primarily single fins, but all channel bottom designs.
Jim was originally inspired to try shaping channel bottoms by an article called ''Groove Ridge Theory'' by Jim Richardson and Art Shafer from the USA that was possibly printed in either Surfer or Surfing magazine circa 1975.
It detailed experiments using flexible polyurethane rubber ridges stuck to the bottom of surfboards and concluded that they improved lift and increased directional stability across a range of designs and lengths.