ADS Mach speed gauge modified by Smiths. This gauge is found in a large variety of classic commercial airliners, and is a larger than average gauge which is in beautiful condition.
The gauge includes a working speed bug. Otherwise, the unit has not been tested in any way. It includes the indicator needle, the overspeed bar, and a variety of coloured flags.
The unit includes its removal tag from the Boeing 737, and the connector cannon plugs on the rear are in good condition allowing the possibility for restoration by a suitably qualified professional.