It fooled me on a first glance, but the movement doesn't look as it should, maybe I am missing something. This is supposed to be a cal 321 but the 321 stamp is missing, whole section of a lever on the top right corner is not there, plate with SN number looks different in color than the rest of the movement. Otherwise the dial looks OK. http://www.ebay.fr/itm/Vintage-OMEG...8?pt=LH_DefaultDomain_212&hash=item2ee0decfaePurchases made through these links may earn this site a commission from the eBay Partner Network
This is a very common occurrence actually, what's happened is someone has taken that 321 Seamaster, stripped it of its 321 movement to either rebuild or put together from spare parts a 321 Speedmaster, and to maximise value they've then fitted a far cheaper Lemania 1270 movement in its place. Basically its worth bugger all, total franken watch. Be VERY wary of any 321 Speedmaster this guy sells.
That looks awfully like a Lemania 1280/1281 to me and I don't believe Omega ever had a variant of that one made for them. I think Omega went straight from the CH27 C (321) to the 1873 (861) By the way, the biggest give-away that this is not a 321 is that it is a cam-set chronograph and not a column wheel.
Man what a piece of crap that is. Looks like he didn't manage to remove all the plating from the chronograph bridge as I can still see specs of copper on it. Or maybe he plated over the copper colour to make it match the rest of the movement and some of that has flaked off. He has also jury rigged a spring for the minute counter jumper since that is usually mounted on the chronograph bridge...
Ironically that chronograph bridge is one of the few things on that watch I would have been interested in before he did that to it.