RAF operations room raid designation plaque - Zone/RDF

Raid Designation Plaque.  Incredibly 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 double-sided plaque measures approximately  2" x 1" / 50 x 25mm and has the word 'ZONE' handpainted in red to one side with 'LINE IN PAR^L. WITH R.D.F. SOUTH' on the reverse, handwritten in black on some form of early plastic.  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.  R.D.F. South is believed to refer to a 'Radio Direction Finding' station, part of the 'Chain Home' early warning Radar system.  We have a small quantity of other tiles available.  A fantastic opportunity to create a small Operations Room display.  Slightly warped/curved.  Stock code M27140.