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yes. the war dept. procured watches and stamped them... I don't recall all the full details as to why but the RAF also purchased pilots watches from 1940 onward and engraved its own part number 6B/159 at this time and watches had often been remarked as a 6B/234, a category requiring less precision. Some 6B/234 cases are overprinting of the A-11 case as seen in those examples.