Finally! The part you have all been waiting for! This is a monitor chassis for many Megatouch games. This is a WG, type 67 chassis. These are pretty reliable, probably 2nd most reliable behind the Tatung monitors. But there are 2 or 3 common failures on these, and they aren't easy to fix.
The WG monitor was used in about a 20% of XL games, and 5% of Maxx games. This is the chassis for 13" Monitors. If you have an XL, you may have a Telcovision, Ducksan, or WG monitor. All of these were used, so look at yours and figure out which you have.