To preface the title of the thread. There is the way collectors define them which is any Gillette razor usually British that has a specific type of TTO knob. Then there is the way Gillette defined it as a type of set and not razor. This thread will focus on the official designation. If you want to know more on how they are unofficially designated see this thread for more information. https://theshaveden.com/forums/threads/gillette-rocket-the-refined-de.8590/ The term Rocket actually sources from Canadian Gillette sets and not British either. In the case of Canadian Rockets it denotes a various styles of cases and razors and for British Rockets on a single style of case with various razors. The Canadian Rocket sets were sold as either Rockets with a nickel plated razor or a Deluxe set with a gold plated razor and were sold between 1949 - 1956. The British Rockets sets were numbered as N054 and sold between 1953 and 1958, they were also sold again in 1962 as a No54a set. Now on to the actual razors packaged with the sets. Some quick trivia, The only razor going by Gillette's naming scheme that is a Rocket and only a Rocket if you want to use the set name interchangably with razors is the Canadian Super Speed styled razor sold in sets from 1950 - 56. That razor is wholy unique to a Rocket set the rest of the razors were packaged in other sets besides Rockets. Information may not be complete and is subject to revision. Each branch of Rocket sets, Canadian and British will be split off into their own seperate posts in this thread.