This is a transponder panel by Gables avionics, and is a classic analogue style panel in grey, which is as removed from possibly early 727, or 737, and is sold as seen. The panel is in good condition for age, and the rotary and switches move as they should but otherwise not electronically tested. The panel would make an ideal real part addition to your flight simulator. The rear cannon plug is in good condition. Own a piece of classic aviation communication history.