Incredibly rare 'Raid Block' marker 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 marker 'K', 2.5 x 2.8cm is printed in red on some form of early white coloured plastic and is riveted to a metal stem aproximately 10cm in length. It would have been positioned on the raid block along with other tiles representing height, raid serial number and so on or on a separate base. Please note you are buying one single marker. Other markers, the block and map etc are shown for illustrative purposes only. This red on white marker woud have been used for 'friendly' aircraft and is in very good used condition. A fantastic opportunity to create a small Operations room display. Stock code M23693.