passenger window
These windows are perspex,has an outer and an inner pane air gap between plug type with a rubber seal around outer edge they are supported by 12 clips when the aircraft is pressurised they plug the hole.the outer pane is about 5to 7mm thick the inner is a little thinner with a tiny hole on bottom edge to equalise during pressurisation cycle.
The reveal around the window is attached to the side panel with the blind that perspex pane is about 2mm thick this may be missing for flight and has nothing to do with the window just there for decorative reasons,these panes often get scratched by passengers.