Here's a transition era hull, Punta Rocas, Peru, 1968. Leo Hetzel photo.
It's probably one of George Downing's boards, from the look of the fin. Dropped rails in the back, moderate hull in the front. Very sophisticated for the era. Felipe Pomar would be a good guess as to the board's owner.
Bitchin' car! And note the early use of canvas board bags...the first truly lightweight boards demanded them for travel.