Kind of an old thread but that cabinet is a Dynamo HS-1 or HS-2. The HS-2 has a slide-out control panel and drawer for the PCB and power supply while the HS-1 does not, but they are otherwise identical. The HS-1 and HS-2 are designed for 19" monitors.
The reason the marquee was cut down to fit is because it was designed for a 25" monitor version of the Dynamo "cut-corner" cabinet, such as an HS-5. The 25" monitor Dynamo's are wider than the 19" Dynamo's.
Though Dynamo cabinets could be purchased new in a generic format in order to install whatever game you wanted, it is unlikely an operator would have bought a brand new 19" Dynamo cabinet to install SFII. Yours was probably converted from an Ikari Warriors or something.