The iRetrophone is hand-sculpted and hand-cast in urethane resin, and the base is a half-inch thick for stability. It is designed to work with iPhone 3G, iPhone 3GS , and iPhone 4. It docks at the bottom, with the cable sliding down into the housing, as you can in the second image.
iRetrophone iPhone Dock
The Cable Slides Into the Housing
Thanks to Luxist for the heads up on this product.