I got mine today. It's white MX8100-8113LRCUS. I popped a few keys and they were all Cherry White Stem non-clicky, feel a lot stiffer than browns in Compaq MX11800.
An odd thing about this board is that it's got a serial port in the back. I tried plugging in to it a serial trackball, but it made the keyboard stop working, so I'm still trying to figure out what it's for. It's a regular RS-232 male serial port, but it's got two knobbies in the surrounding molding that stick out about 1/16" and prevent a regular serial cable from getting fully inserted.
Keyboards: IBM Model M 1391401, CVT Avant Stellar, CVT Avant Prime, Dell AT101W, TypeMatrix 2020, Compaq MX 11800, Chicony KB-5181, IBM M-13, Chicony KB-5191, Wang 724,
Pointing devices: Contour Rollermouse & Pro, Microsoft Intellimouse Trackball, Kensington TurboBall Trackball, Evoluent Vertical Mouse, 3M Ergonomic Mouse, Zero tension mouse, MS Ergonomic Laser Mouse 6000, Logitech TrackMan Wheel, Wowpen Vertical mouse, Logitech Trackman Marble, Digital Research DRTRACK Trackball