Stores Reference 6B/117. Manufactured by Smiths English Clocks Ltd. of Cricklewood, London. Approximately 5cm diameter. White metal Dennison case with white dial, black hands, Arabic numerals and subsidiary minutes dial. Engraved to rear of case with 'A.M., 6B/117' and '5532/GG'. Keyless winding and running for a period of 8 hours from fully wound. The chronograph action is controlled by the winding knob. The design and action of this 'SW43' mechanism are such that the second hand should indicate correctly to one-fifth of a second, and starting and stopping errors should not exceed one-fifth of a second. Intended for general application and aircraft use. The 'Dennison' case is in very good order apart from some burrs from previous careless opening. Light scratching on the perspex crystal. The dial is excellent and the movement is in good working order. Stock code C27048.