I don't believe this is the appropriate place for that. Off the top of my head, I would suggest contacting an auction house: Sotheby's, Cristie's and the likes. Second option is to hook up with reputed Panerai dealers. I'm sure there are a number of them "on line" that can be contacted for information etc etc. The Panerai bubble has...burst though and I would suggest being realistic about potential expectations, should you have any. I wish you lots of success and I would very much like it, if you let us know how it went
I know the collection has been with you for a while. As I wrote, I have seen it no less than 2 or 3 times already