ThinkPad X200 Tablet: How to tell a multi-touch model from a stylus only model

[KineticIsEpic]

Is there a way you can tell the difference between the x200's with and without the touch screen by looking at them? It seems that some have a plastic overlay on top of the screen, and some don't. Would that indicate if the particular machine has touch capabilities? If that's not the case, is there at least a list of model numbers with and without the touch screen?