Beta 1 Xenon Dev Kit

As you can see from this view there are no 'Xbox 360' or 'Microsoft' marking's on the side's or on the front.
The console runs not only the XDK dash but also, for the very first time, it runs a proof-of-concept version of the Xbox 360 'blade' style of dash, that we use today.
Note the rather nice Prototype designation sticker.
Note also the entire console is white except for the black rubber USB doors.