Incredibly rare 'Raid Block' tile 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 double-sided tile 'UA31' / 'B7' is handpainted in black on some form of early yellow plastic and measures approximately 50 x 25mm. It would have been positioned on the raid block along with other tiles representing height, raid serial number 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 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 M25333-4.