The logo is hand drawn on toilet paper says Johnny , and has Mike Hendy's initials on it.
The board was made at a point where the evolution of board design was driving along at a fast rate , and boards were getting shorter, wider and thicker , and the twin fin design would soon take off as a design to be tried, but later rejected for slim and longer singlefins which became the standard surfboard design through the mid 70s.
Photos of Tris Cokes, courtesy of Johnny Manetta
Porthtowan crew in the early 70s. Johnny 3rd from left , Tris 3rd from right .
Thanks to Johnny and Ryan for the info and photos