Hull# 3227 Class# 2538
The fact that your boat has 2 numbers, which I believe are marked on a small metal plate inside the cockpit tells me that she would be a pre-1973 model. All boats built after 11/01/72 will have a 12-digit hull I.D. Number molded into the outside of the transom, O'DAYs built prior to that date have an O'Day Hull# and a Class#. However, if the numbers you list are what was marked on your boat, I think a few digits are missing. The Hull# refers to how many total O'Days had been built, i.e. you have the 3227th O'Day Sailboat built. Class# refers to how many Javelins, so you have the 2538th Javelin built. The Javelin was introduced in 1962, and by looking at info that I have about other O'DAYs, it seems that O'DAY hull# 3227 would have been built around 1959 or 1960. My guess is that your hull# should be more like 32270 +/- or 13227....in other words, there should be another digit before or after 3227. I'd estimate Javelin Class# 2538 would be a 1969-71 model, figuring on production being in the 300 units per year that was typical for each O'DAY model in those years.