Built between 1968-1972, launched 1972. Designed in 1949 by William Atkin for author E.B.White but never built, plans were later sold as "Captain Cicero a 29' 10" Knockabout". I received this information from Pat Atkin, widow of the son of the designer John Atkin.
Atkin & Co. - Captain Cicero
Flickr: Zee-Miesha's Photostream