It looks like a stunted c-case to me... http://www.ebay.de/itm/Original-Omega-Constellation-Automatik-Uhrwerk-cal-552-/152150081452Purchases made through these links may earn this site a commission from the eBay Partner Network
It is a Omega Geneve ref. 165.041, cal. 552 with a redone dial Has nothing to do with a Constellation - Frankenwatch http://naligazone.com/index.php/data-watch/omega/caliber-5/507
It's a franken watch, but not with a redone dial. The dial is actually from an unusual constellation, ref 163.0001: http://naligazone.com/index.php/data-watch/omega/13-watch/omega/710