Manifold Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, Bendix, Constellation

This is a pair of 1950's-era dual engine Manifold Pressure Indicators, made by Bendix and labeled for engines #1 & #2 and 3 & #4.  Used in post-WWII 4 engine aircraft such as B-50, C-54, C-121 etc. The 1958 Flight Manual of the Lockheed C-121 Constellation shows these instruments located on the pilots instrument panel as well the flight engineer's panel. 

The instruments are in very nice condition for their age.  The dial markings are clear and the glass and cases are intact. The glass for #1-2 needs cleaning from the inside, which is usually simple to do, but I'm leaving that to the buyer, and has a slight crack at the 10 o'clock position. It comes with side service markings from Naval Air Station Alameda CA. The indicator for engines #3-4 has the Munsell green markings on its scale typical of US Navy aircraft. Measures 3.25 inches diameter and ~6 inches deep.