i don't see any board named "freestyle"...?
"simple paint scheme"-- is it all one color? like a silvery blue color or orange color?
my best guess with the descriptions you are giving would be an obrien "Evil Twin" 1997 http://www.wakeworld.com/boardguide/getboard.asp?boardid=44
can you take a pic of the board?
do you see any other lettering besides "obrien" and "freestyle"
any molded in fins?
what is the depth of the fins? 2 inches or so?
my guess is that the board you have is fairly old. and the handling, though not bad, is "out of date" really, especially if you plan to do anything more than just cutting arround on it.... BUT again this is based on the assumption that the board is from the 90's