$4,000 is around the mark for a Panerai 111 you might do better by a couple of hundred.
The Pam 111 is a polished stainless steel model it is COSC and has the patented crown protector. It also has a display back and sandwich dial (if you get after the 'G' model) and is part of the Panerai Heritage range. It has a manual wind movement with a swan neck regulator.
Good Luck