Royal enfield changed the frame and tool box to a different style in 1956. The 1955 model, which has been manufactured in India, with little change since that time, still has the triangular shaped tool boxes. These are the only types of tool boxes that I have ever seen decals on. Royal Enfield varied them by year and so did the ones made in India. The 1956 and later tool box lids were in fact held on by the one winged thumb screw in the middle.