WWII U.S. Navy Shaft Revolution Indicator System Bell Code Plaque Dated March 1943

Original naval propulsion-related display featuring a Shaft Revolution Indicator System identification plate manufactured by The Electric Tachometer Corporation, Philadelphia, Pennsylvania, dated March 1943.

Mounted beneath is a Standard Bell Code instruction plaque outlining engine room propulsion commands for ahead, stop, back, and full-speed operation based on propeller shaft rotation.

These systems were used aboard naval and merchant vessels to monitor propeller shaft revolutions and communicate propulsion orders throughout the ship.

A highly decorative and historically significant piece of maritime engineering history with strong World War II and naval appeal.

Dimensions:

• Height: 10"
• Width: 8"

Condition:
Good condition with age-related wear, scratches, and oxidation consistent with shipboard use and age. Both metal plates remain mounted to the original display board.