This is a jumbo Omega Seamaster Calatrava from 1956. At 36mm this watch was dramatically larger than most watches of the period. This watch is powered by a caliber 284 17 jewel manual wind movement. 

The dial of this watch is black with steel applied hour markers. The printing on the dial is completely original. 

The watch is mounted on a black calfskin strap. 

This watch has been serviced and is running well. It will come with a one year warranty.