The Apple Universal Dock is an official iPod Dock from Apple. There were three versions of the Apple Universal Dock released. The 30-pin docks were discontinued sometime around 2013.

(2005) Apple Universal Dock

This was the first release of the dock. (More info is needed)
iLounge's Review of the 2005 Dock: https://www.ilounge.com/index.php/reviews/entry/apple-computer-universal-dock-and-apple-remote-ipod

(2007 Revision) Apple Universal Dock

In 2007, Apple re-released the Universal Dock, both adding and removing certain features. (More info is needed)
iLounge's Review of the 2007 Dock: https://www.ilounge.com/index.php/reviews/entry/apple-universal-dock-2007

(2010) Apple Universal Dock

In 2010, Apple once again made a revision to the Universal Dock. (More info is needed)
iLounge's Review of the 2010 Dock: https://www.ilounge.com/index.php/reviews/entry/apple-universal-dock-2010

Sources

Archived Apple Store Webpage of 2005 Apple Dock: https://web.archive.org/web/20050404101840/http://store.apple.com:80/1-800-MY-APPLE/WebObjects/AppleStore?productLearnMore=M9868G/A