Well, first I can tell you that she was built prior to 1972, boats built after 01NOV72 have a 12-digit Hull ID Number molded into the outside of the transom.
O'Day boats built prior to that (like yours) have 2 numbers, a "HULL#" and a "CLASS#". The hull # indicates how many total boats O'Day had built and Class# refers to how many of that model (in this case, JAVELIN).
Based on the hull#, I'd say your boat is approximately a 1966 model, maybe 1965 or 1964. 1962 was the first year for the Javelin.
[For reference, my 1969 O'DAY Widgeon was O'Day Hull# 22698]
The best way to try to narrow that down would be to post a question on the Javelin Class web-site.