Rare Vintage OMEGA Seamaster Winding Date Mens Watch - eBay (item 290469433608 end time Sep-06-10 11:40:40 PDT)
Case looks like deville. Dial says seamaster.
Crown apparently is original. Cross hair Dial repainted.
Caliber 610. 17 jewel manual
From the web...
OMEGA Watches With Multiple Model Names On Them
There are certain watches where you will see two model line names on the same watch. During the 1960's, a number of watches were released under the combined "Seamaster DeVille" name--combining the water-resistant Seamaster cases with the more advanced movements found in the DeVille line.
Another series of dual-name watch are certain Speedmaster models where the case back says Seamaster. These were to promote that the Speedmaster contained superior water resistance, a feature uncommon in many chronographs at the time.