Altimeter, Mk XIIIC, 30,000ft, British Royal Air Force Ref 6A/445 A4 Skyhawk but perhaps not surprising for

but perhaps not surprising for an artifact of its age

and all components may not be present

indicating a manufacturing year of 1957

The aircraft from which this instrument was removed appears to have had an upper operating limit of 2800 RPM judging from the limit markings in thin red tape that have been applied upon the numerical scale beneath the glass

This instrument is stamped with a service date of December 1959

Altimeter, Mk XIIIC, 30,000ft, British Royal Air Force Ref 6A/445 A4 Skyhawk but perhaps not surprising forHere is a British Altimeter (Height Indicator) Mk XIIIC Ref 6A 445 as used in RAF aircraft during WWII with a maximum altitude of 30,000ft. The knob rotates the face of the instrument to correct the scale, which is then indexed by the small round window at the 5 o'clock position. Altitude is displayed along the outer scale as the pointer rotates clockwise from 0 at the 6 o'clock position to 16,000 ft at the 5 o'clock position, and then from 16,000 to