This Ebay auction claims this is a Rolex movement.

[old skool]

http://cgi.ebay.com/ROLEX-CORTEBERT-VINTAG...1QQcmdZViewItem

[dadog13]

he says as well that is good for a vintage panerai...however, no vintage Panerai has ever had that kind of movement...and on top of that I don't beleive it is a Rolex movement..

[astiz]

I think that it's Unitas...