A Burmese knau sailing on the Irrawaddy River, designed by Burmese artist N.K.D. Naigamwalla, printed by lithography, and issued for use in Burma on November 15, 1938, Scott No. 29, plus a relevant illustration.
Here are images of the three stamps in a set depicting various International 420 Class Dinghies, printed by photogravure, and issued by Israel on July 8, 1970 to publicize the 420 Class World Yachting Championships, Scott Nos. 419-421, plus a YouTube link to a short video demonstrating 420 Class Dinghy racing. Note: In August 1970 Israel again won the 420 Class championship and the David Tweed Cup, defeating France in the final race.