Code: M26585
By Aston & Mander & Co., London. 1942 dated. 'Capt. Field's Improved' boxwood parallel rule with brass fittings. Approximately 45cm in length x 6.8cm wide when closed. Clear Air Ministry and crown markings. The rule has a few minor edge bumps and light scratches but in very good overall condition. As used by the Navigator for route plotting in bomber aircraft. Map not included. Stock code M26585.