June 2012, I have an Omega pocket watch in for an overhaul. It looks like that only the balance staff is broken on one side, the rest just looks ok.
A new balance staff is needed, one stone needs to be renewed and I would give it a new glass. Finding the parts will take some time.
I think the balance staff broke when the watch fell once as the case has a significant dent.
July 2012, With a little help from my friends the balance staff was changed and the watch is ticking again. Still, some more work with the case waiting.
August 2012, Omega confirmed that the caliber is a 19''' LOBNN built on the 18th of September 1916.