This is the pressure control panel as removed from the Boeing 737 overhead panel. This panel is used to control the cabin pressure.
The unit is in good condition, the panel could be cleaned to remove some of the dirt. The valve gauge shows slight rust, but could easily be repainted. The cannon plug is in good condition, and protected with a plastic cap.
This panel is very hard to find. It would make an excellent filler for your overhead panel in the simulator. The panel is sold as seen, and has not otherwise been tested.