On September 25, 2006, Apple shipped the second-generation iPod nano, offering a fancy aluminum redesign of the pocket-size original model.
(via Cult of Mac - Your source for the latest Apple news, rumors, analysis, reviews, how-tos and deals.)
Cult of Mac
Today in Apple history: iPod nano gets colorful aluminum upgrade
Shown as published in the source's RSS feed. IndiaAIFounders doesn't link out to third-party sites — this is the complete detail available from the feed itself.