US Military UNION INSTRUMENTS Protractor Gauge
A US military UNION INSTRUMENTS protractor gauge.
Marked '8 US' with the UNION INSTRUMENTS Shield trade mark.
Graduated from 0 to 190 degrees.
Fitted in a bespoke lined wooden box marked '"U.S.C.E."', believed to indicate the United States Corp of Engineers.
Some signs of wear to the covering on the box.
61/8 inches high, 141/2 inches overall length including the arm.