I just bought myself and my mom used 1st generation
Ipod Nanos. I found out by accident that this model is the subject of a recall announced earlier this month. If you have one (it is either white or black with a metal back), you should check to see if your model is one of the recall models. Very likely, you would receive a refurbished model of the same type you send in and not (as I would hope) a newer Ipod. I'm just happy to get this with a new battery since I here battery changing on a Nano is a little complicated (I have a 4th generation Nano too). The recall only affects 1st generation models and the serial number tells them if yours is one with the bad battery.
http://www.apple.com/support/ipodnano_replacement/