Sperry vintage automatic pilot used as the pair the one that goes on the left is Bank climb gyro control A3 gyro pilot no 7602 glass missing. The one that goes on the right directional gyro control model A3 gyro pilot no l722 both made by The Sperry Gyroscope co both approx. 30cm deep and 20cm tall bank is 13cm wide and weighs 4k the direction gyro is 19cm wide and weighs 7k .