RAF Operations room plaque - 'LEGAL'

Unusual clear acetate 'plaque' believed to have been used in RAF Filter and Sector Operations Rooms during the Battle of Britain and beyond to display the name allocated to a specific enemy raid.  Approximately 13.2 x 3.8cm marked 'LEGAL' in black.  Came in with other similar plaques and operations room pieces.  A fantastic opportunity to create a small operations room display.  Good condition.  Stock code M26674.

NB. Map not included.