Architectura et Amicitia held a competition for design of a vacation and weekend house on the Vecht in 1936. M.F. Duintjer made a design with motto '3377' for the competition. The jury received 65 designs. The jury awarded the design of Duintjer, architect in Amsterdam. The article discusses all entries and shows five of them. Illustrations: 2 plan drawings/Holiday house on the Vecht (design M.F. Duintjer); perspective drawing/Holiday house on the Vecht (design M.F. Duintjer); sectional drawing/Holiday house on the Vecht (design M.F. Duintjer); 2 elevation drawings/Holiday house on the Vecht (design M.F. Duintjer)