Rate of Climb / Vertical Speed Indicator, 5 M/S, Luftwaffe Variometer F-14 as used in the RAF's

as used in the RAF's Cold-War-era Handley Page Victor strategic bomber

the knob adjusts the index pointer for mach speed along the perimeter of the mach speed scale

An accelerometer with an identical face appears in the Oct 1950 flight manual of the Boeing B-47 A Stratojet Bomber (see photo)

according to the Maintenance Interchangeability Chart dated Feb 1945

It has two overhaul date stamps

Rate of Climb / Vertical Speed Indicator, 5 M/S, Luftwaffe Variometer F-14 as used in the RAF'sHere is an early WWII era Vertical Speed Indicator used in aircraft of the German Luftwaffe, measuring vertical speed in a climb or descent from 5 meters second to + 5 meters second. It appears to be Fl. 22379, although it is not marked with an Fl number. It has a manufacturing date of November 1938. Measures ~3. 25 inches diameter and ~2. 5 inches deep. It is in reasonable condition given its age.