Sector Clock Type 1 (Model-512) The very popular representation of the Sector Clock all so known as the "Opp's Clock" presented in a traditional style 12" dark wood 512 Schoolhouse standard quartz clock with glass lens secured by a gilt plastic mount. The RAF Operations Room Clocks otherwise known as "Sector clocks" examples can be found in many RAF Museums from operations rooms during the 2nd World War. Though Ops Clocks were still being made and used in RAF Stations well in to the 1950's. These Sector Clocks are not trying to be copies or replicas of the originals, only providing by design the nostalgic look of a Battle of Britain Ops clocks this one was copied from the original Sector Clock of Biggin Hill which is situated at the Spitfire & Hurricane Memorial Museum at Manston Kent. Requires 1 x AA battery. Xarim are official suppliers to the Royal Air Force Charitable Trust Enterprises Our Price: £27.45 Buy 3 of any Xarim Clocks for a Fantastic 20% Discount. Quantity: