Stores Reference 6B/221. Probably by Smiths English Clocks Ltd. Approx. 5cm diameter. Intended for general application and aircraft use. 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 mechanism are such that the second hand should indicate correctly to one-fifth of a second, and that starting and stopping errors should not exceed one-fifth of a second. White metal Dennison case with white dial, black hands and Arabic numerals and subsidiary minutes dial. Engraved with 'A.M., 6B/221' and very faint/worn1943 date code to the rear. The dial is in very good condition. Light marking/scratching on the case. Good working condition. Mechanism not photographed as the inner dust cover is difficult to remove. Stock code M20288.