Posted by James Briggs on November 05, 2002
In Reply to: O.K. posted by Cozmo on November 05, 2002
: The aristocracy of old New York City (early 19th Century) often belonged to the "Old Knickerbockers" club. If you were a member, you were "o.k." Hence, today's expression.
Check up the Archives again - there are many other suggestions, none certain.