a golf ball weighing no more than 1 . 62 ounces and having a mean outside diameter of at least 1 . 70 inches . the core compression of the ball and the cover hardness are selected so as to provide a finished ball having a p . g . a . compression of 80 or less and a coefficient of restitution from 0 . 780 to 0 . 825 . the ball includes a dimple pattern covering at least 70 . 0 % of the surface of the ball .