Physical description

Course and Speed Calculator MKII - Air speed in MPH and Knots. Wind Speed and direction. In original wooden box. Used on aircraft.

Inscriptions & markings

RAF Ref. No. 6B/125 - RCAF Ref. No. 6B/52
No. ST2473/40 Anson/Oxford
Serial No. 3441S/40
Box Ref. No. GB/120

Subjects