Made in by The London Name Plate Mfg. Co. Ltd., London & Brighton. Stores reference 6B/108. Circular white metal instrument, approximately 14.5cm/5.5" diameter. Has rotating discs for setting the ground barometric pressure, temperature, indicated height and airspeed. For use with isothermally calibrated altimeters. Used by Navigators when plotting routes etc. Clear Air Ministry marks and 1940 date code. Predates the more commonly found Mk.II & IIA. Excellent used condition with issue box (though this has a different serial number). Stock code M20432.