I just bought a beautiful Sunfish that's been stored in a barn for the last 35 years. It literally looks like new. The owner told me it was a 1974 and the features would confirm it's at least in that age range. No paperwork and not registered since 1985. Trying to find the serial number. There is no metal plate near the splash rail although there is a plastic sticker in that place. Unfortunately, I can't read anything on it. Ideas?