Creative Review talked to Coca Cola archivist Ted Ryan about his company's new show at the Design Museum in London featuring the creation of one of these signs. The sign in this picture is from 1954 and was located in London's Piccadilly Square.
You can find the entire interview in the upcoming issue of their magazine, but they already have an awesome gallery of images documenting every step of the process on their blog. There's also scans of the sign's technical manual detailing all the nitty gritty specifications. [CR blog] .