Radio Control Box BC-450A for SCR-274 Radio Set (with replacement crank) US Coast Guard The black screen behind the

The black screen behind the horizon has a bit of corrosion centrally

This indicator has 3 calibration screws along each outside edge of the dial

to indicate the gross flow (not the precise rate) of oxygen from the primary oxygen tanks (not portables) to the local junction at each station

Weston model 425

5 inches diameter by ~4

Radio Control Box BC-450A for SCR-274 Radio Set (with replacement crank) US Coast Guard The black screen behind theHere is an authentic WWII era Radio Control Box BC 450A was a component of the SCR 274 N command radio set as used in aircraft of the US Army Air Force and US Navy such as heavy bombers B 17, B 24, and B 29 and medium bombers B 25 and B 26. SCR 274 was a multi channel, multi component aircraft radio receiving and transmitting system (see 2 page description in photo gallery). The BC 450 provided the pilot with remote control of 3 radio receivers. This