Incredibly rare 'Raid Block' number used in RAF Filter and Sector Operations Rooms during the Battle of Britain and beyond to display important information relating to the strength of an enemy raid. The raid block itself was normally positioned at the head of the plotting path and provided information such as strength, height and whether the aircraft were 'hostile', 'friendly' or 'unknown'. This number '3' approximately 1.5 x 2.5cm, is printed in black on some form of early plastic and probably used to represent the number of enemy aircraft. It would have been positioned on the raid block along with other tiles representing height, raid serial number and so on. Please note you are buying one single number tile - other numbers, the block and map etc are shown for illustrative purposes only. We have a very small quantity of numbers available. A fantastic opportunity to create a small Operations Room display. Stock code M23374-2M.