Seriously? I would love it to say iPad2! If I had one, that is.
You can tell by looking at the Model number on the System. For iPad original:
Wi-Fi + 3G Models:
MC497LL/A
MC496LL/A
MC349LL/A
Wi-Fi Models:
MC294LL/A
MC293LL/A
MC292LL/A
Doesn't help with just a glancing look, but it will be accurate