23 13/16" square for the outside dimensions.
16 5/16" x 12 3/4" for the inner cutout dimensions.
Keep in mind that those measurements are only as accurate as the operator who originally cut my bezel. Street Fighter II: The World Warrior was only sold as a kit and was intended specifically for Dynamo cabinets. The back of the bezel has printed lines showing where to cut depending on which model of Dynamo cabinet you have. My Dynamo is an HS-1 (19" monitor) so the cuts were made along the HS-1/HS-2 cut lines (there are also cut lines for the HS-5 and other 25" monitor Dynamo cabinets). Whoever originally made the cuts did a good job, though one of the cuts is below the line by maybe 1/32" of an inch.