These are original arcade game marquees (aka headers) from full size arcade games. For most of the games prior to 1987 these marquees are plexiglas or glass. During the late 80s many manufacturers switched to using vinyl for marquees, which are placed behind a piece of clear glass (not included).
Please note the condition when purchasing, marquees described as having wear when backlit will show some light through when used on game. These marquees are usually still suitable as wall decor as they wear isn't as noticeable when it is not backlit.
Original plexi glass marquee
Original glass marquee with some typical wear