Lot of Gyro Caging Knob Mechanisms (External) for Gyro Horizon Indicator C-5 C-7 AN-5736 Constellation The red maximum airspeed pointer

The red maximum airspeed pointer index is set by accessing an adjustment screw

an amplifier and a master indicator located at the navigator's position

and the bottom flag is red

we originally acquired this from a naive seller

The outer ring is to be rotated to match the selected shutter speed

Lot of Gyro Caging Knob Mechanisms (External) for Gyro Horizon Indicator C-5 C-7 AN-5736 Constellation The red maximum airspeed pointerHere are 6 spare Gyro Caging Knob Mechanisms for the Artificial Gyro Horizon. Without a part number, we can't state if these were used in both US WWII types C 5 or C 7 AN 5736. Note that this is just the external mechanism for knob caging and does not include the knob itself, screws, or internal gyro caging mechanism. Price is for all 6 shown in the photo gallery.