Manifold Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, Bendix, Constellation F-86 This periscope appears to be

This periscope appears to be new old stock

The thin gasket beneath the glass is slipping from its position

made by Maxwell Smith Co

The two 'button's on the face are red lights which would illuminate the horizon when twisted

so it is pre March 1942 vintage

Manifold Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, Bendix, Constellation F-86 This periscope appears to beThis 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