go to the Dam and ( if you standing in front of the palace, With your back to the palace. ) you'll see the DIAMOND CENTER on the right side.
They have AP , Rolex, JLC,Panerai and some others
The Antiquorum Sale catalog in June is available for viewing online, but there is also a 100 meg pdf downloadable file. Over 300 pages, pretty cool and it provides some nice viewing. Many watches and lot of details
http://www.antiquorum.com/eng/june09_ny_fcatalogue.html