This is an Airspeed Data vintage knot speed indicator for an early 2000s DC – 9 aircraft. It was manufactured by Astek Instrument corporation Armonk, New York. The Mach speed 50-400 knots indicator is from a TWA Airlines DC-9. I don’t have any way to test this speed indicator so I’m selling it as is, for parts or restoration. Please check the photos closely for complete details.