Airspeed Indicator AN-5860T2 Piasecki & Sikorsky Helicopters
Here is an Airspeed Indicator, 10-150 Knots, as used in the Piasecki HUP / US Army Mule Helicopter during the 1960's and the S-61 Helicopter of Vietnam. The paint on the dial perimeter indicates safe operating range
It is in very good condition given its age. Measures 3.25 inches diameter and ~2 inches deep.