Identify hardware variant? Moisture damage indicators? Weak, buzzy vibration?

[Demur]

How can you figure out what hardware version a given Moto G is (e.g. US GSM, global GSM, CDMA, other?)?

Are there any moisture / water damage indicators I can check on a Moto G?

Is weak, buzzy vibration (e.g. for haptic feedback) typical on these?