Kneeboard-George Greenough Flextail A rare Greenough Design flextail made in the Sky factory at Byron Bay by Michael Cundith and George around 1976. A rare collaboration by a great designer and a top shaper., measure 5 feet 7 inches x 22 inches with a single fin box and a rare polycarbonate Greenough type fin, with a concave hull design. Condition-7/10 as a significant ding repair on the bottom, plus a few minor dings and fractures, but totally original and still displays well.