Rate of Climb / Vertical Speed Indicator, 6000 ft/min, Army Type C-2, US Army Air Corps, WWII
The Army Type C-2 Rate of Climb /Vertical Speed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B-17, B-24, B-29, medium bombers B-25 and B-26, as well as light bomber A-20, according to the Accessories Interchangeability Chart dated Feb 1945. It was also used in versions of US Army Air Corps WWII fighters P-38, P-39, P-40, P-47, and P-51.
This C-2 was made by Pioneer, part number 1636-61-A1, and has a serial number prefix of AC-41, indicative of a 1941 manufacturing date, very early indeed. It is marked on its face: AC US ARMY, for the Air Corps.
It is in very nice condition given its age. The pointer does not rest at 0, but could probably be repaired if desired. Measures 3.25 inches diameter and ~5 inches deep.