This item is a rare and original aircraft protractor MK.3-B.BU. AERO, used during World War II (1939-45) by the United States Navy. The protractor is part of a collection of militaria items and is in great shape.

The piece comes with a fascinating history and was made under contract no. 94551FS.S.E. It is a fantastic addition to any collection of original period items from this era. The device is perfect for display or as a collector's item for anyone interested in the history of military aviation.