An original Second World War Royal Air Force cockpit clock, Mark 2D pattern, as fitted to a wide range of RAF aircraft during the early 1940s. The dial is clearly marked “MK.2D – 6A/1275 – 10448/41”, identifying the Air Ministry stores reference and confirming production in 1941. The reverse carries the A.M. (Air Ministry) crowned stamp used on officially accepted service instruments.
Constructed in a black anodised metal case with an unscrewing front bezel, housing a glass crystal and brass-finished winding/setting crown to the side. The black dial displays luminous green Arabic numerals and triangular minute markers, with matching luminous cathedral-pattern hands. The marking “8 DAY” denotes its mechanical movement with eight-day running duration between windings.
Markings: “8 Day / MK.2D / 6A/1275 / 10448/41” Air Ministry crowned “A.M.” stamp to reverse.
Approx. Measurements: Face diameter 6.2 cm (2.4 in); overall height 4 cm (1.6 in).
Historical Note: The Mk.2D was part of the RAF’s 6A instrument range, covering flight and navigation clocks used across fighter and bomber types. Issued from around 1940 onward, these clocks were installed in aircraft such as the Supermarine Spitfire, Hawker Hurricane, Avro Lancaster, Wellington, and Mosquito, providing essential timekeeping for navigation and mission coordination. The design evolved from earlier Mk.1 and Mk.2 variants to offer improved shock protection, clear night visibility through radium-luminous numerals, and simple mounting for quick replacement. Surviving wartime examples are rare.
*Condition* Good original condition overall, showing light wear and minor surface marks consistent with service use. Bezel threads and case mount points intact; dial and hands well preserved with good colour to numerals. Mechanism untested. Please see photographs as part of the condition report.
