The lighter boats started in 1984 but they were weighted with lead shot down one of the pylons. They had an "H" scribed on the front of the front pylons and of course the red glue seam on the edge of the hull lip. Minimum wieght dropped from 340 to 320 but the difference was usually greater than that because most boats were not minimum weight before that time. I waited until 1986 to buy my new one because they changed class minimum weight then.

They do pick up water over time so if they are stored dry they will stay lighter. So an 83 could be lighter than an 85. They didn't get light again until around 92 when they started etching the hull wieghts in the stern.

cheers
Bill