For late 1955 models (spring 1955) Color code "F" ("Colonial Blue") was offered. On most paint chip charts (including DuPont) for 1955 no code "F" appears. Nor, does the color name "Colonial Blue" appear on those same paint chip charts. http://pc.dupont.com/hcl/search/imageViewer.jsp?imgurl=/hcl/data/Data/Domestic%20Cars/GM/Buick%201954-1961/BUI%201955/003094.jpg&mode=fullscrn http://pc.dupont.com/hcl/search/ima...k 1954-1961/BUI 1955/003096.jpg&mode=fullscrn On 1956 paint chip charts; color code "F" , color name "Cadet Blue" appears. http://pc.dupont.com/hcl/search/ima...k 1954-1961/BUI 1956/003098.jpg&mode=fullscrn For my car the Paint code is BFF . Or, Dover White/Colonial Blue/Colonial Blue. The paint on my car was mixed to match the color of the original paint the dash. Someone, has asked me what is the DuPont color code # for my car. Would, I be correct in saying that the paint the 1956 Color code "F" "Cadet Blue" is the the same as the 1955 Color code "F" "Colonial Blue" (DUCO 2174) ?