Rare WW2 Battle of Britain Period R.A.F Operations Room Plotting Counters & Map

Exciting opportunity to acquire this set of rare Operations room 'counters'  for showing information relating to an enemy raid . When details of raids were received at Group level  they were displayed on a map table using plotting 'counters' in the form of coloured arrows and discs   Arrows indicated the direction of aircraft seen over land by Observers or over sea .   Discs indicated circling aircraft.  The colour of the plotting pieces relates directly to those on the colours on the Sector clock and the information was updated every 5 minutes.   The counters are approximately 2.5cm ( 1 inch) long, made from painted metal and in very good condition with minor wear. Consisting 28 counters in red,blue orange and green . Together with a post Battle of Britain period map of East Anglia and North London  . Map dated "6/41" .This would make a good complete Battle of Britain Operations room display