Ordnance Dept OF - Waterproof Case.
Nickel plated Circular Case measures 40mm lug to lug x 32mm wide non-inclusive of the Crown while using Calipers.
Screw on Caseback is Stainless Steel and stamped as shown.
Very low Serial number.
In need of an Hour Hand and Glass.
** Watch purchased from Pearl City, Hawaii which resides on the Northern Shore of Pearl Harbour, the Home of Ford Island U.S. Naval Air Station on the Hawaiian Island of O'ahu.