Mine is an '85. I tried to scan and include 2 Powerboat magazine reports. I will have to try again later if you are interested. I believe they are of '85 and '86. The earlier had square rails and windshield frames. The later were round. By '89 the ICBM and the radar arches became popular. They also discontinued Executioner and some were marked with an X or ICBM on the side. The cabin door had changed by '88 and Quadrant controls became standard. The boat remained otherwise basically unchanged outside.