Microsoft Xbox Repair Manual page 18

XBOX VERSION DETECTION - SERIAL NUMBERS (V1.2 - V1.3)
There's no perfect method to see the difference between a v1.2 and v1.3.
We do know that all PAL Special Edition translucent green Xbox consoles (this is NOT the same
as the NTSC Special Edition Halo Xbox) are still v1.2.
If you have a normal black Xbox, try the serial# check in STEP3 on http://www.xbox-
linux.org/wiki/Xbox_Versions_HOWTO to see if you have a v1.2 or v1.3
You have a v1.2 serial or PAL translucent green Xbox (not the NTSC SE Halo):
You have an Xbox v 1.2
You have a v1.3 serial: You have an Xbox v 1.3
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