hello snick,,serial #9521611 ,this watch have the omega movement caliber 23.4 T1 SC ,,THE SIGNIFICATE CENTRE SWEEP ,,I THINK WAS THE FIRST ONE CENTRE SWEEP REFERENT TO OMEGA WATCHES.I think the Neptune's pitchfork style hand was supposed to signify that this model was supposed to be "waterproof", or at least as close as they could get in those days. Sort of an earlier form of Seamaster. old Omega Medicus/neptune's trident on legendary movement 23.4 SC. It is legendary because it is first movement with center second in Omega Manufacture history. It comes from 1935 - 1938. The name of this model: Medicus came from the fact it was very expensive model becouse of new movement with center seconds and waterproof / water resistant case. Only doctors and other wealthy people could afford for it.
The movement, cal. 23.4 SC on 15 jewels with characteristic big jewel on the pin of the balance wheel. After servicing in great condition.