Raid Designation Plaque. Rare 'Raid Block' plaque used in RAF Filter and Sector Operations Rooms during the Battle of Britain and beyond to display important information relating 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 relatively crude single-sided metal plaque measures approximately 1" x 1" / 25 x 25mm, is painted red and has the number '4' handpainted in white (faint image of a number 2 can be seen beneath the paint). It would have been positioned on the raid block along with other tiles representing height, strength and so on. It fits both the metal and wooden style blocks as shown but please note you are buying one single tile - the blocks/map are shown for illustrative purposes only. We have a small quantity of tiles available. A fantastic opportunity to create a small Operations Room display. Stock code M27101.