Well here is a xbox I have sitting here now .. not modded yet till thursday
I expect everything to work out fine using ICE Chip pin header install with lpc rebuild by hand.
Xbox Date: 2005-02-16
5838.01
5960.01
White and Red DVD Wires
Brown Wires leading to on/off board
****UPDATE*****
Since I wrote this.. I have flipped the board over to find all the same points available for a xenium Ice chip...
I do not have this chip yet to install on this particular box.. but I recently did one that looked like this made in 2005 and it worked out fine.
I did notice that their seemed to be a couple different things on the board.. but again this could just be a 1.6b that I have never really noticed any difference from a 1.6-1.6b besides hearing the wires are different colors.
So.. As of right now.. I believe this IS a 1.6b unless someone points something out. But if something goes wrong thursday I will let the forum know (of course someone else will probably have the answers by then)
What brand RAM does it have? If it's Hynix then it's a 1.6b.
Also, if the kernel is 5838, then it's probably just a 1.6/1.6b. But then again, it is possible for them to make hardware changes without changing the kernel.