Main difference is a Mk2 has round rotary button on the right side whereas the Mk1 has none.
A Mk1 has round left side buttons, and pretty much a smooth face to it, the Mk2 has a black plastic faceplate that looks similar to a airfoil shape.
The bottom two are Mk2's the top is a Mk1 in this [url=link]photo[url]


#695-Mk2/8 colors-12Gig w/Tuner- awaits v2.x & Voice Recog.