I couldn't find it in the most likely Omega reference book to have it. Closest I could find online was this:
http://auction.catawiki.com/kavels/2343839-omega-de-ville-men-s-wristwatch-1980s
Hard to read the case back, but trying a few variations, this popped up a couple of them in Google:
MD 196.0312.1
So that's my best guess at the reference number. The auctions will give you an idea of the value. Quartz doesn't do that well.
Oh, and as to setting the date. If the crown doesn't pull out to two positions, you most likely will have to spin the hands around 24-hours for each day to get to the right date. A pain, but some watches work that way.
Cheers
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