Looks real to me. Probably a cal. 56X automatic movement there. Not sure if the dial is original. Picture is too blurry.

You'd need to take it to a watchmaker and get pictures of the inside of the caseback and movement.

Hope this helps,
gatorcpa

 

Interesting, the same photos from the April 2008 inquiry by John.
http://www.watchtalkforums.info/forums/omega-forum/7061.htm
No updated images?
Anyway, besides it is a mid 60's DeVille and probably a 56x cal there is not much more we can tell you at this point.

 

Could it be "166.033" on the back?

De Ville

Gents' leather strap

Dimensions: Ø34,4 mm
Reference
ST 166.0033
International collection
1966 - 1972
Movement
Type: Automatic (mechanical)
Caliber number: 565
Created in 1965
24 jewels
Central sweep-second hand
Functions
Date
Case
Stainless steel
Case back
Unishell (case opening on dial side)
Dial
Metal, with luminous metal hands
Crystal
Armoured hesalite
Bracelet
leather
Water resistance
30 meters



Information from the Omega Vintage Database:

http://www.omegawatches.com/spirit/history/vintage-omegas

Certainly looks like a match to me,
gatorcpa

 

Duh, forgot to add the extra zero in my search.