BrainBoxLtd on 07 December 2007
For the Wii itself, it'd be the serial number. But this is the Stars Rewards thing, so I'm not sure if the console counts towards that. (I'm in the US) Still the serial number, least for the NTSC Wii's, is on a sticker with a Barcode, usually on one of the sides of the Wii, typically on the underside (when in vertical position) Mine started with WU then a bunch of numbers.
