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R.A.F. Height & Airspeed Computor, MK.II

By The London Nameplate Mfg. Co. Ltd. Stores ref. 6B/131. 1940 date code. Circular white metal instrument. Has rotating discs for setting the ground pressure, temperature, indicated height and airspeed. For use with ICAN calibrated altimeters. Used by Navigators to when plotting routes etc. Very good used condition. Well marked. Stock code M17220.