RARE Vintage Hobie Surfboard 69-70 Positive Force IV Twin Fin, Flat Tail. Mickey Munoz designed, Terry Martin shaped. This board dates back to an experimental design era in the early 1970s, needs a little glass work (see photos), but overall very good condition. The item "RARE Vintage Hobie Surfboard 69 Positive Force IV Munoz Terry Martin Twin Fin" is in sale since Tuesday, July 30, 2019.This item is in the category "Sporting Goods\Water Sports\Surfing\Surfboards". The seller is "accuriosities" and is located in Levittown, Pennsylvania. This item can't be shipped, the buyer must pick up the item.